I was using another route to get in, sorry about that.
Anyways, here are tactics to kill Kylikki after you get in.
Jump up, hit Kylikki.
Two Spellguards on top will teleport down, they will have black clouds around them.
When they teleport down they do a series of AoE damage, run like **** as soon as they stop channeling the clouds, this is the indication they will teleport.
After they teleported and stopped their AoE they do minimal ranged damage and only do a lot of damage after teleport. So damage when they're done with teleport and run when they're teleporting.
Two spellguards will be summoned down, if you don't kill them both Kylikki will be healed. (Or not, haven't checked but kill to be sure anyways :P)
Kylikki can only be hit by PbAoE spells. For the Necromancer (my class) you can best use a nightfall build and channel Deathly Blizzard, use Decay, Blasphemous Ruin and the ice equilavent of Decay in rotation.
Please note that this is a _RAID_ boss and has like a million HP.
GROUP THE **** UP OR DIE OF BOREDOM!
If you do it solo it will take 2,5 hours ++
Melee classes are excluded of doing damage and should entertain with jokes
With a Necro, ToS and PoM it took 45 minutes. This might seem long but how long do you think it'll take to clear the whole instance.. right, much longer.
I'm guessing the best group composition is ToS, PoM, Necro and a Demo.