Short version.
This is SOLOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO I REPEAT HAN F SOLO CHRONICLE.
You will be punished for partying, there is no party bonus, you burn more sayha because you party, only worth in loa deep farming knoriks because sayha burns more based on the number of mobs u slay not the exp you get.
Mega whale - play death knigth dark elf( only dark elf, others are shit).
F2p to minnow/dolphin/whale - play titan, if you play with friends can have 1 tyrant to do hex.
Thats it.
Long version
DEATH KNIGHT
dark elf - with full gear epics +3, dolls 3+ high str, top gear etc. Can oneshot all clan, Aoe has no limit, even other whales will be left 1 shot from death. Die 1 time on purpose, revenge with circlet triggered = dead enemies. Also you have passive which every 10 minutes lets you survive lethal damages for few seconds and port out.
Titan strong, does not recuire mega whale gear. + warsmith puller for aoe
Tyrant strong, but titan is stronger. Annoying af when gets 4 star book - cocophony of war ( lethal chance if he lands it you get 1hp, can fight any whale 1v1 even with less gear if he has this skill).
Overlord - strong enough to survive to port out + annoying debuffs.
Se - good debuff stigma, has mass recharge does not need orfen +2, but paper easily killable and will lose tons of coins, stigma does not land on epics in new patch.
Sylph has cool buff/debuff, otherwise kind of annoying, 1-2 per clan/side.
Cardinal only good if supported by whales in the cp, can solo farm only with chiken aoe (hard), or orfen +2, otherwise useless. (3x whale cardinal trinity is very hard to beat but who in their right mind put tons of $ to play supports, crazy right?)
Swordsinger, tanky because of skill dodge. Annoying, high enough dmg to punish support like se and make them lose coins.
Other classes are not even worth mentioning.
Classes to watch char kill mobs on minimal gear - bladancer/warcryer.