Uh… Fighting ISIC as Rath is easy enough until he goes into floating skull mode, then it’s constantly knock ups and no control over your character to catch him, not to mention the falling animations for rath block sight nearly completely if you’re not looking 3/4 up, where ISIC isn’t even at.
…
This was a complaint from beta as well. All we can tell you is don’t solo with melee, or prepare for a long annoying fight.
You have to solo as El Dragon for the lore, though.
You have to get the last hit, not quite the same. Melee is possible, it just is a long grueling fight
Its still crappy design to make a boss hard to melee when 9 of your battleborn are melee character