One shots without any reason or warning!

I remember you guys gloating about how you will know when a boss is doing an ability that can one shot you and I feel lied to. Many abilities one shot and many abilities have no kind of notice. I have a geared out lvl 89 char and one shot can happen in t12-16 I can clear easy I mostly one shot everything I have crazy def because the ideas you put behind mapping is ridiculous nobody enjoys having to preform to perfection and even if you do... ONE SHOT BAM NO NOTICE unless I want to spend the time reading every single ability. The game has a good pace and stopping to do that is not anything anyone will ever do except maybe steelmage and ziz.