Necromancer: Support role due to low defense, will help out Conquerors/Guardians by inflicting enemy with debuffs and using pets to attack or defend.
Reason: Necromancers are down right dark and evil as you can get, unleashing hordes of hell like spawn monsters and giving the enemy a hard time, this is why they are necromancers they love to make other people suffer slowly or painfully with evil dark means.

Assassins: Ambush tacits along side with Barbarians, will strike when Barbarians have enemy distracted. (Never go out on main battle, consenquence is death)
Reason: Assassins are our little stealth squad, they can take out enemies with with ease (when not spotted) and can help out other classes but making the enemy suffer.

Demonologist: Support role due to low defense, will help out Conquerors/Guardians by inflicting enemy with debuffs.
Reason: These bad boys are our major debuff squad, inflicting pain or curses to make the enemy yell out in Mitra's name to save them, while doing this it's best to let our warriors make them suffer a bit more, more physically.

Pets or mounts: Should be used as last resort or cover when fleeing battlefield. If enemy has pets out on battlefield target them as main priority since they are very devestating on the battlefield.
Reason: Players or enemies using mounts or pets are very dangerous aoc gold because with the rhino or mammoth they have long sweeping ranges that can inflict major damage and cause other players to fall down which letting the enemy have an much much easier time at killing you. Also when using as cover, they can distract the enemy so that you can make a daring escape without dieing.

Btw it is always good to use your own creativity, so make up your own ideas and ways to win!