Then i attack him til stagger and call in odin. This usually puts the boss down to 75% health.
Now he starts using his Destructo ability and this is where im having problems.
If i take a sentinel then i can just about survive this attack but by the time i get the boss down to 30-40% health he casts doom and i dont have enough time to kill him.
If i try and attack him while he's charging Destructo then i cant do enough damage to cause the mini stagger (that reduces the damage of his attack), i've tried RAV/RAV/RAV and COM/RAV/RAV multiple times and never been able to do enough damage.