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, explained below.

Calculation and factors

Mood values (M)
A value that is set by the map creator for each wandering monster. • Default level is 'Aggressive'. • If the M-value is a range, a random number is picked at the beginning of the battle.
M	Aggression level
-4	Compliant
1–7	Friendly
1–10	Aggressive
4–10	Hostile
10	Savage
Sympathy values (Sy)
How many of the hero's creatures are from the same creature type as the wandering creature (upgraded does not matter)? • Exception: Water/Ice, Fire/Energy and Earth/Magma Elemental upgrades count as different types.
Sy	Sympathy description
0	Zero
1	At least one
2	Over 50% of the hero's creatures

Strength values (St)
A value based on the relative strength of the 2 armies (See equation for 'k' to left). • '*' means rounded down
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
Diplomacy values (D)
The level of the Diplomacy skill. • Add +1 if playing on Easy difficulty and not having Expert Diplomacy
D	Diplomacy level
1	No Diplomacy skill
2	Basic level Diplomacy
3	Advanced level Diplomacy
4	Expert level Diplomacy

Possible Creature Actions

C < M → Creatures will fight

• C is the Charisma value (see equation below)
• M is the Mood value (see chart on right)

C ≥ M → 3 possible outcomes

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

Supporting Equations

C = S_t + D + S_y

• S_t is is strength value (see table to right)
• D is Diplomacy value (see table to right)
• S_y is Sympathy value (see table to right)

k = H × Hero army Strength / AI army Strength

• H is hero strength value (see equation below)
• NOTE: The army strength is the sum of AI creature values.

H = √(1 + 0.05 × A) × (1 + 0.05 × D)

• A is the hero's attack skill value
• D is the hero's defense skill value

External links

• Thread: Diplomacy internals on Heroes Community]