Mektul, The Forgemaster - Exploit

In act 3 vs Mektul, you can use frost bolt to push him all the way back to the end of the tunnel.

I didn't try other spells but it seems to start if you start hitting him backwards when he drops to one knee right before running back to the lava. If you hold-spam frost bolt it will keep pushing him forever.

Funny thing is, even with this I still don't have enough DPS yet to kill him in time. That guy's got a lot of health lol.