Japalatook'tei

The 3 or 4 mobs in front of him are not grouped with him (or each other) and can be body pulled down the ramp. There's one flying mob that just wants to join in the fun, let him! Get rid of these before engaging Japalatook'tei. This is a fairly easy "burn or beat down" mob with one exception. When he gets low on health he'll start spawning Soothsayers to heal him. Burn down the Soothsayers as they spawn to prevent them from healing and then you can finish killing him.