Ya. Chronozon just melees. You know you'll have to hit him with each of the blast spells( kinda makes me wonder why they're Chaos gaunts and not Death gaunts), so make sure you at least do that. If it splashes you have to use that spell again. You can hide from Chronozon by standing a bit south on the east side of the Obelisk. The poison spiders are annoying, but don't make it impossible to safely mage Chronozon. I maged Chronozon from there. Antipoisons, food, runes, and stuff. Definitely the ectophial. One click and you're out of there. But remember if you're teleblocked you won't be able to telly out of there.