The Hidden Forest

I'm just getting ready to try Rallos Zek. To get him to spawn do the other two Zeks need to be dead, or do I just need to have credit for killing them both (which I have done)?

And lastly, will I need Zek weapons for my casters? ATM I have zek weopons only for my melee- assuming of course my casters would only be nulkking. Thank you guys!!1

they have to be killed IIRC. And the clicky nuke from the bane weapon for casters is a nice chunk of damage, but not really required. (although having one pet user get it gives you the summon bane weapon spell which will let pets do dmg)

yeah VZ and TZ have to be killed so you can enter the instance of RZ. You do need bane weapons to damage him with melee but caster can use normal spells. Just keep in mind that the bane damage are really nice and the procs too so getting caster blunt with bane clicky on it will be a very nice dps boost, and it will also give you, if I remember correctly, the spell that summons bane weapons for pets.
Finally, be aware that RZ isn't a hard fight in itself, but a race against clock. You need a strong dps to kill him in time before he depops. So yeah, bane weapons for melee, casters, pets and debuffs are all welcome.