I made the mistake to think because I was 80 I could just jump in summon without clearing anything and kill Ahune... well I wiped ... Then I read a bit and cleared the trash around spawn area and - most importantly - dropped frost resistance totem - which does make the fight trivial (you can then ignore the spikes; they just make you jump with no/minor dmg; while without it kills you fairly quickly) - also good to know that there is almost no point dps'ing him but instead need to wait for "frozen core" to show up in later phase - so your goal in first phase is just to kill adds and stay alive

If you don't have any frost resistance then it's probably tough and you need to move, which depending on your team makeup may be painful