zombies are semi-usefu in pvp. they mess up targeting for the other players, they wil traget zombies instead of u and wthe zombies will basically tank.
with zombies you get a extra debuff for incineration (this is really for pve thoigh)
with zombies u gain access to 3 CC skills.
bwa kayiman - it knocksdown for a few seconds, if u have 1 zombie out, you can use bwa kayiman, if the zombie hits a player/monsters, the enemy gets knocked down and they get hit frequently, so basically they are locked in knockdown, it easier to do it with more than 1 zombie, but chances are you arent gonna spawn that many in arena, in duels its effective.
tet mamak la - knocksback and spammable, pretty hard to aim on a moing target, if a wizard stops to cast, this interrupts ans kncoksback/down, so then if ur fast enough, u can use it again and lock them in knockback, takes skill though.
damballa - if the enemy is rotted, stunned, frozen, stuck in place, damball does masive damage and knocksback/down enemy.
without zombies you wont be CCless
effigy- witht he atribute, effigy gets a 25% chance to blind for 5 seconds,
hexing - not really a CC, but a wizard told me it intterupts his casts (so like a mild silence with 100% uptime)