Water Aqcus (Aqcus)

Aqcus the Summoners War's Water Charger Shark works best as a Faimon Hell Farmer due to his passive, that every time it kills an enemy he heal as much as the damage dealt, his attribute advantage (water) and his high skill damage multipliers.

He is also easy to skill up and with his leader skill you don't need god runes to do the job.
If you are thinking about building him for Faimon, remember that accuracy is not so useful here because you will not rely on Dots to kill enemies but only on damage, which is
also important for the heal you get back from his passive skill, so build him Violent and Revenge (or Vampire to a safer build) and go straight on Attack and Crit Damage stats,
unless you are on early game than you can go Fatal/Blade.

Water Charger Shark is generally a good monster, useful in many occasion from early to mid game, in dragon b10 and giant b10 he is viable as a DoT stacker, speed debuffer and
attack breaker making your team safer while doing great damage to the boss.
He is also suitable for PvP offense (AO and GO) with water atk booster (like Orion Water Brownie Magician) in case you don't have a better speed leader.

Despite he is a must from low to mid-end game, we dont suggest to six star him, generally speaking he has low base stats, he heals himself only if he kills an enemy, the critical buff lasts 1 turn only and last but not least because you will like to get soon a Water Nine-tailed Fox (Soha) or a Water Ninja (Susano) who are better fits for the same job.

Charger Shark Water (Aqcus) Suggested Runes

Early Game Farmer - Fatal/Blade (Atk%/CR%/HP%)
Faimon Hell Farmer - Vampire/Revenge (Atk%/CD%/Atk%)