A brute sized zombie that has blades covering his whole body(in a stabbing fashion). He has the ability to steal all your weapons by sticking it into his body upon you striking him. You deal really little damage with swords and arrows. The only way to deal high damage is to strike at the swords sticking out of his body, pushing them in piercing his core. He will then roar in pain, the sword will be shot out as a powerful projectile.
It has a couple of attacks. 1 is grabbing you with the head which deals damage while you are in there, usually used to pull players into water. 2 is assault which basically launch the head at the target to deal damage. 3 is breath out poison. 4 is smokescreen that blinds targets. Each tentacle can be killed individually but they will regenerate but it takes quite a while to regenerate. 5 is spawning Abyss Eels that are created by chopping off the tentacles. It does this as an active and passive skill. 6 is creating vacum that either pulls around targets in or pushes them away. 7 is water pressure. It can temporally raise the strength of water level near it causing mobs/players near it to take damage, nausea, weakness and quicken their breath to run out
He attacks by shooting sphere of ice that generates ice along with causing slowness. Direct hit will result in damage, high slowness and mining fatigue. He can also strike lightning. He can spawn Witherskeletons, Zombies, Skeletons, Blazes and rarly Ghasts. He also temporally buffs all nearby undead mobs with strength and can heal them but only 1 mob in every 10 secs.
He has 2 powerful spells which is 1 the withering bolt that shoots a black smoke at target to deal high wither but is slow and can only home onto targets a bit. Another is Death Garden which creates a radius of thorns around the Magus Lich that deal wither. The thorns will disappear after 5-10 secs.
Upon reaching low HP, he will grab his huge skeletal sword to deal massive damage. But he can at most swing allround the sword and use his withering bolt with his sword.
He grows stronger in the Nether or night. He is really really weak at daylight.