Got mine 10 mins ago on Test server.I parked my 78 DRU in DN to check Vaniki spawn.4 days no luck but after the patch today,finally got Vaniki spawned,and its not just a normal Vaniki,its FABLED Vaniki.
Not too many infos about this rat.In today's standard,even caster can tank it no problem.Max hit on 83 SK is 1234,it flurry too.Spend lots of time on casting and tried Gating at low HP.
Drop 2 Willsapper(one fabled,one normal) and some quest items.