I mean, it doesn't matter how well you build your character with gear, if you play carelessly you're gonna die sooner or later anyway... just with a less defensive build you have to be a bit more careful. Nova is a short range skill and is probably high risk no matter how you build it. Blocking is one thing but you can't trust 50-75% block chance. Sooner or later you're going to get 5-7 consecutive hits doing 200-300 damage each and get ko'd. So clever use of merc and defensive play is probably the only way to survive.. you can't trust anything else. If you do that, in conjunction with strong other gear pieces, you can probably use infinity on sorc with success.