Join

Joining is a feature where a stack of wandering creatures are willing to become a part of hero's army for free or in exchange for gold. Whether or not the stack will join depends on several factors, but basically if hero's charisma value (C) is lower than creature stack's mood value (M) the creatures will fight. If charisma is greater there are three possible outcomes:

1. the stack will join for free,
2. the stack will join for gold, or
3. the stack will fight.

Calculation and factors

Mood values
M	Aggression:
-4	Compliant
1–7	Friendly
1–10	Aggressive
4–10	Hostile
10	Savage
Strenght values
St	k
11	k ≥ 7
2 × (k-1)*	1 ≤ k < 7
-1	0,5 ≤ k < 1
-2	0,333 ≤ k < 0,5
-3	k < 0,333
* rounded down
Diplomacy values
D	Level of Diplomacy
1	No Diplomacy skill
2	Basic level Diplomacy
3	Advanced level Diplomacy
4	Expert level Diplomacy
Sympathy values
S	Description
0	There are no creatures of the same kind as neutrals in hero's army. This includes upgraded creatures as well, and works in both ways for all, except for Magma/Earth, Ice/Water and Energy/Fire Elementals.
1	There is at least one creature of the same kind as neutrals (including upgrades as in paragraph above) in hero's army.
2	Total number of creatures of the same kind as neutrals in hero's army (including upgrades as in paragraphs above) compromises more then 50% of the army.

M > C → Creature stack will fight M ≤ C → Creature may join

C = P + D + S C is Charisma value P is Power value D is Diplomacy value S is symphaty value H = √(1 + 0,05 × A) × (1 + 0,05 × D) H is hero strength value
A is attack skill value
D is defense skill value AI is sum of all creatures' AI value A_TOT

External links

• Thread: Diplomacy internals on Heroes Community]