You Hardcore guys are crazy!

[Elric of Grans]

I do not think I have ever suffered a death to Belial. The meteor attack requires careful attention. Yes, meteors. The `puddles' are letting you know where he is targeting, and how long until it hits (the visual effect changes over time). It is safe to stand in them before the meteor hits. Watch the timing on them, then stand still until you need to move. Use movement skills (teleport, leap, vault) if in a pinch. Once you learn the pattern, it is very easy to get through that without taking a hit. The hardest part of Belial, in my opinion, is how you need to be built for taking on a group of enemies at the start, then focus on a single target at the end. It requires a nicely balanced build, unlike the other bosses who you can put together a cheap anti-boss build for.