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==Background information==
{{Secondary skills}}
{{Secondary skill
| B_effect = 10% of enemy creatures killed are [[Animate Dead|resurrected]].
| A_effect = 20% of enemy creatures killed are [[Animate Dead|resurrected]].
| E_effect = 30% of enemy creatures killed are [[Animate Dead|resurrected]].
}} '''Necromancy''' is a [[secondary skill]] that enables the hero to raise killed enemy creatures as [[Skeleton and Skeleton Warrior|Skeletons (or Skeleton Warriors)]]. All [[Death Knight]]s and [[Necromancer]]s start with basic Necromancy skill, except [[Isra]] the [[Death Knight]] and [[Vidomina]] the [[Necromancer]], who both start with advanced Necromancy. Other hero classes can not learn Necromancy, but they can acquire it from [[Scholar (Adventure Map)|Scholar]]s, [[Event]]s or [[Witch Hut]]s.


Necromancy is one of many [[Secondary Skills]]. Unlike the other secondary skills, Necromancy is not learned. That is to say that only the [[Necropolis]] heroes [[Necromancers]] and [[Death Knights]] can normally have this skill, and each of them already starts with it. [[Witches]] were sometimes able to learn Necromancy when leveling, but this was changed in later versions. Non-necropolis heroes can learn Necromancy from [[Witch Hut]]s or [[Scholar (adventure map)|Scholar]]s if the mapmakers allow it.
In {{hota}}, the skill precentages are decreased to 5%, 10% and 15%.


'''Recommended for:''' Any Hero commanding Undead Armies.
'''Heroes with a specialty in Necromancy:'''
* {{H|Isra|Death Knight}}
* {{H|Vidomina|Necromancer}}


==Description==
'''Skill affecting factors:'''
* [[Amulet of the Undertaker]] – Arftifact increases Necromancy skill +5 %
* [[Vampire's Cowl]] – Arftifact increases Necromancy skill +10 %
* [[Dead Man's Boots]] – Arftifact increases Necromancy skill +15 %
* [[Necromancy Amplifier]] – Structure increases Necromancy skill +10 %  (bonus stacks if you have multiple towns with this building)
* [[Soul prison]] – Structure increases Necromancy skill +20 %


When a hero wins a battle, a portion of the opposition killed is resurrected as skeletons and added to the hero's army.
Additionally, with [[Cloak of the Undead King]] it is possible to raise other undead creatures instead of Skeletons. However, the cloak does not affect the skill precentages.


*Basic effect: 10% of enemy battlefield dead are resurrected as [[Skeleton]]s.
== How does it work ==
*Advanced effect: 20% of enemy battlefield dead are resurrected as [[Skeleton]]s.
All killed '''enemy''' creatures can be raised as skeletons. This includes [[sacrifice]]d creatures, [[clone]]d creatures, summoned [[elemental]]s and even [[war machines]]. If the victorious hero's army contains only Skeleton Warriors and there are no empty slots available, the killed enemy creatures are raised as Skeleton Warriors instead of Skeletons. However, in this case only 66.6% of Skeleton Warriors are raised compared to Skeletons. If there are no available slots and no skeletons  (either kind) in the army, none of the killed enemy creatures are raised.  
*Expert effect: 30% of enemy battlefield dead are resurrected as [[Skeleton]]s.


The number of skeletons brought back at the end of the combat depends on three main factors:
# Number of creatures in killed stacks
# Amount of health of killed stacks
# Level of Necromancy skill


==Heroes with a specialty in this skill==
First, the total number of raised Skeletons can never exceed the number of creatures slain in combat. Second, the total health of raised Skeletons can never exceed the total health of killed creatures. Third, the level of Necromancy skill used in calculations can never be more than 100%. Although it is technically possible for a hero to have Necromancy skill above 100%. These rules are applied to every killed stack individually, and always rounded down. In addition, at least one creature is always received from the combat where the winning hero has Necromancy skill of any level and creatures are killed.
*[[Isra]] the [[Death Knight]]
*[[Vidomina]] the [[Necromancer]]


==Artifacts affecting this skill==
The health of the enemy creature killed affects the efficiency that it is revived as per table:
*[[Amulet of the Undertaker]]
*[[Vampire's Cowl]]
*[[Dead Man's Boots]]
*[[Cloak of the Undead King]] {{insod}}


==Buildings affecting this skill==
1 hp = 16.6% efficiency<br>
*[[Necromancy Amplifier]]
2 hp = 33.3%<br>
*[[Soul prison]]
3 hp = 50% efficiency<br>
4 hp = 66.6% efficiency<br>
5 hp = 83.3% efficiency<br>
6 hp or higher = 100% efficiency<br>


==Additional information==
So a hero with 50% necromancy, who killed 100 creatures with 6 hp or higher will obtain 50 skeletons, whereas if he were to kill 100 peasants (who have only 1 hp) he would only obtain about 8 skeletons
If you don't have [[Skeleton]]s or an empty army slot, but do have [[Skeleton warrior]]s, you will get [[skeleton warrior]]s, but only 2/3 of normal numbers.


==In-depth==
Additionally, with [[Cloak of the Undead King]] these same rules apply to [[Walking Dead]], [[Wight]]s and [[Lich]]es. As they have more health, less is raised. And if the hero only has upgraded versions, the "two thirds rule" is applied.


This is copied from http://www.heroescommunity.com/viewthread.php3?FID=6&TID=11784,
== External links ==
and originally written by angelito.  Edited for clarity.
* [http://heroescommunity.com/viewthread.php3?FID=6&TID=11784 ''How does the necromancy skill work exactly?''] Heroes Community thread started by angelito.


Many times I thought about the necromancy skill and how it works exactly. When I read my "Heroes-updater-list", where there is described what was changed with which patch, there was a point about the "reworking" of that skill coming with the 1.3 patch.
[[Category: Secondary skills]]
So I think since this version, that skill works fine and could be explained very easy (with one exception....but read that later...).
__NOTOC__
 
===Basic===
Some question had to be figured out:
 
;Which necromancy skill counts, the one you have before you go into a fight, or the one which you have after the fight?  Normally the level-up happens first, and then the result of the risen [[skeleton]]s is shown. : After some testing, it's clear. The skill you have before you get into a fight is counted.
 
 
;How do the necromancy bonuses count? Are they cumulative, or are they all based on your necromancy skill? : I also did some testing here. They are all cumulative.
 
 
That means that if you have expert necromancy, have built the [[Necromancy amplifier]], and have the [[Vampire's Cowl]], then your effective necromancy skill is 50%.
 
;One exception : The skill specialty "Necromancy", like [[Isra]] has, is always based on the "natural" necromancy skill the hero has. That means, if [[Isra]] is level 20, his necromancy skill does NOT rise to 100%, but up to 80% (30% expert necromancy, 30% specialty (20*5% of 30), 10% amplifier, 10% [[Vampire's Cowl]]).
 
 
;When I have expert necromancy (30%) and fight against a stack of 100 creatures, how come there are not exactly 30 [[skeleton]]s raised after the fight? :This is the most misunderstood fact of this skill, and I think that is what is meant with the "reworking of that skill". The number of raised skeletons is ''not'' based on the number of creatures you are fighting, but rather on the total of their [[health|hit points]]! <nowiki>*</nowiki><br>
<nowiki>*</nowiki>This is not entirely true. Both Health and numbers are calculated, and the smaller of those are used. This means that numbers are the limiting factor in almost all cases.
 
===Examples===
====Example 1====
 
You fight against 1000 [[Gremlin]]s and have expert necromancy.
How many [[Skeleton]]s will be raised?
 
*Total [[health|hit points]] of the gremlins were 1000*4 = 4000
*Expert necromancy means 30% of "hit points" will raise = 1200
*How many skeletons will you "get" for 1200 hit points?
Right...exactly 200.
 
====Example 2====
 
You fight against 30 [[Gremlin]]s and have basic necromancy.
How many [[Skeleton]]s will be raised?
 
*Total [[health|hit points]] of the gremlins were 30*4 = 120
*Basic necromancy means 10% of "hit points" will raise = 12
*How many skeletons will you "get" for 12 hit points?
Exactly 2.
 
====Example 3====
 
You fight against 500 [[Gremlin]]s and have expert necromancy, a [[Necromancy amplifier]], the [[Amulet of the Undertaker]], and [[Isra]] Level 10.
How many [[Skeleton]]s will be raised?
 
*Total [[health|hit points]] of the gremlins were 500*4 = 2000
*Expert necromancy (30%), [[Isra]] Level 10 (10*5% of 30% = 15%), amplifier (10%), amulet (5%); that makes 60%
*60% of 2000 hit points = 1200 hit points.
*How many skeletons will you "get" for 1200 hit points?
Exactly 200.
 
====Summary====
So there are some points to notice:
 
*You can't raise more [[skeleton]]s than the number of creatures you are fighting against.
*Your necromancy skill can't rise above 100%.
 
This fact is especially relevant when you play with [[Isra]] or [[Vidomina]], who have necromancy as their specialty.
 
'''Take a look at this situation:'''<br>
You are an expert necromancer, have all 3 necromancy artifacts ([[Amulet of the Undertaker]], [[Vampire's Cowl]], and [[Dead Man's Boots]], but not as a [[combination artifact]]) and 2 towns where the [[Necromancy amplifier]] is built. That will give a total of 80% necromancy skill. When your hero now is Level 20, normally this number will rise to 110% (Level 20= 20*5% of 30 = 30%).
<br>But that is not possible.
 
If you fight against 1000 [[gremlin]]s with 100% necromancy skill, you will raise 666 [[skeleton]]s (1000*4=4000, 4000/6=666).
There is nothing you can do to raise this number of skeletons after that fight. (I made [[Isra]] a level 50 hero and he raised exactly 666 skeletons).
 
===The 3 stack thing===
But now I will mention the one exception I could not figure out.
 
When I did those test fights, the [[gremlin]]s were split into 1 or 2 [[stack]]s (I fought with 100 [[Titan]]s) and the calculations were all great, in theory and in practice.
But sometimes, the gremlins were split into 3 stacks, and then the calculation did not work exactly: the number of risen skeletons was smaller than calculated.
 
So I tried to figure out when 1 or 2 stacks would appear and when there were more stacks of gremlins.
 
I tried it with nearly every number between 10 and 100.
Only when there were 40 gremlins were they separated into 3 stacks. I tried 80, 120, 160... every time there were 2 stacks.  I tried 400, 4000... every time 2 stacks (I changed the number of my [[titan]]s, I changed the spreading... always the same).
The next number I could figure out where the gremlins were split into 3 stacks was 2000 (I chose some random numbers and was lucky).
 
 
Here are the test results against a neutral stack of 40 gremlins (which were split in 3 stacks: 14, 13, and 13):
 
With basic necromancy, only 1 skeleton was raised after the fight (normally it would be at least 2: 40*4=160, 10% of 160=16; this makes 2 skeletons with 4 hit points left).
 
With expert necromancy, only 6 skeletons were raised after the fight
(normally it would be exactly 8: 30% of 160 = 48; this makes exactly 8 skeletons).
 
 
Then I did the same fight against a hero with 40 gremlins:
 
Against 1 stack.............. 8 skeletons raised
Against 2 stacks (20, 20).... 8 skeletons raised
Against 3 stacks (14, 13, 13) 6 skeletons raised???
 
I tried it with more than 3 stacks (500 gremlins in 5 stacks to 100), and it works fine, exactly as calculated.
 
Tried it with different numbers per stack (4 times 100, 1 time 101), works fine also.
 
So there has to be a (for me) "unknown" factor when fighting against a stack of creatures which were split into 3 stacks... does anybody know this? ''Or it's just a bug. --[[User:Terra|Terra]]''
 
===Afterword===
Please remember, that this calculation works only since version 1.3!
Hope I helped some guys to figure out how they can raise 3000 skeletons on week 6...
 
Though I know necro is banned in the zone mostly, this could be interesting stuff for some of you.
 
[[Category: Secondary Skills]]

Revision as of 16:09, 5 August 2018

Secondary skills
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Necromancy
Basic Necromancy: 10% of enemy creatures killed are resurrected.
Advanced Necromancy: 20% of enemy creatures killed are resurrected.
Expert Necromancy: 30% of enemy creatures killed are resurrected.

Necromancy is a secondary skill that enables the hero to raise killed enemy creatures as Skeletons (or Skeleton Warriors). All Death Knights and Necromancers start with basic Necromancy skill, except Isra the Death Knight and Vidomina the Necromancer, who both start with advanced Necromancy. Other hero classes can not learn Necromancy, but they can acquire it from Scholars, Events or Witch Huts.

In Horn of the Abyss, the skill precentages are decreased to 5%, 10% and 15%.

Heroes with a specialty in Necromancy:

Skill affecting factors:

Additionally, with Cloak of the Undead King it is possible to raise other undead creatures instead of Skeletons. However, the cloak does not affect the skill precentages.

How does it work

All killed enemy creatures can be raised as skeletons. This includes sacrificed creatures, cloned creatures, summoned elementals and even war machines. If the victorious hero's army contains only Skeleton Warriors and there are no empty slots available, the killed enemy creatures are raised as Skeleton Warriors instead of Skeletons. However, in this case only 66.6% of Skeleton Warriors are raised compared to Skeletons. If there are no available slots and no skeletons (either kind) in the army, none of the killed enemy creatures are raised.

The number of skeletons brought back at the end of the combat depends on three main factors:

  1. Number of creatures in killed stacks
  2. Amount of health of killed stacks
  3. Level of Necromancy skill

First, the total number of raised Skeletons can never exceed the number of creatures slain in combat. Second, the total health of raised Skeletons can never exceed the total health of killed creatures. Third, the level of Necromancy skill used in calculations can never be more than 100%. Although it is technically possible for a hero to have Necromancy skill above 100%. These rules are applied to every killed stack individually, and always rounded down. In addition, at least one creature is always received from the combat where the winning hero has Necromancy skill of any level and creatures are killed.

The health of the enemy creature killed affects the efficiency that it is revived as per table:

1 hp = 16.6% efficiency
2 hp = 33.3%
3 hp = 50% efficiency
4 hp = 66.6% efficiency
5 hp = 83.3% efficiency
6 hp or higher = 100% efficiency

So a hero with 50% necromancy, who killed 100 creatures with 6 hp or higher will obtain 50 skeletons, whereas if he were to kill 100 peasants (who have only 1 hp) he would only obtain about 8 skeletons

Additionally, with Cloak of the Undead King these same rules apply to Walking Dead, Wights and Liches. As they have more health, less is raised. And if the hero only has upgraded versions, the "two thirds rule" is applied.

External links