Copied and expanded from the description i made of the bosses on one of my single player levels:
, 400 hp:
Will deploy extra armies in the same territory as the boss every 5th turn after the 6th. The boss will make the first deploy at turn 6, next at 11th,16th etc.
Amount of armies deployed follow this formula: 10+(n-1)*13 where n's value is given by the number of times the power of the boss has activated. eg, At turn 21, power activation = 4, therefore 10+(3)*13= +49 armies.
, 20 hp:
This boss can only be killed in one attack. At turns 11 and 14 it will increase it's power/hp from 20-->60-->300
Like boss #2, it can only be killed in a single attack. Once killed, it will spawn 4x90hp bosses in random territories. Each 90hp boss will spawn 3x80hp bosses when killed, for a total of 13 bosses. The bosses can't spawn on commanders.
IF on the enemy Ai team:
It will spawn troops in an enemy or allied territory every 3rd turn: starting with the 4th turn, 7th,10th etc. If you had troops on the spawn territory, they will be erased. It will spawn troops in the enemy territories on turn 4,10,16,22etc, while it will reinforce his own territories on turns 7,13,19 etc
The amount of troops spawned is:
Starting with turn 4, and every +6 turn after that: 7*n where n's value is given by the number of times the power of the boss has activated (remembering that it activates every 3 turns). eg at turn 22 n=7 (turns: 4,7,10,13,16,19,22) and the boss will spawn 49 troops.
Starting with turn7 and every +6 turn after that: 11*n. eg at turn 19 n=6 and the boss will spawn 66.
To make this clear, this is how many troops the spawn will create in the first 25 turns:
Starting with turn 25 both effects activate at the same turn and you will see 2 spawns.
If the boss#4 is on your team:
He will activate in a different manner. He is probably bugged since he will kinda function like an enemy ai boss. He will only spawn on your own territories and will erase any troops you own before the spawn took place. eg at turn 10 your boss uses his power on a territory you control with 50 troops; you will end up with only 21.