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 the 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.

In other words, if the charisma value is greater than mood value there is a possibility that the stack will join, but they may still be willing to fight.

Calculation and factors

Mood values
M	Aggression:
-4	Compliant
1–7	Friendly
1–10	Aggressive
4–10	Hostile
10	Savage
Strength 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
Sy	Sympathy description
0	No creatures from the same creature type.
1	At least one creature from the same creature type.
2	Over 50% creatures from the same creature type.

C < M → Creatures will fight

C ≥ M
1. Stack will join for free if S_y + D ≥ M
2. Stack will join for gold if S_y + D + 2 ≥ M
3. Stack will fight if S_y + D + 2 < M

C = S_t + D + S_y
C is Charisma value
S_t is is strength factor
D is Diplomacy value
S_y is sympathy 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

k = A_TOT / N
A_TOT is total army strength
N is neutral army strength

AI is sum of all creatures' AI value

A_TOT

External links

• Thread: Diplomacy internals on Heroes Community]