[@ADamnFiddle]

Fair points, but here's my thought process.

The fire magic is a basic thing I figured. While the world is magical and fantasy-like, it doesn't necessarily mean certain aspects won't be similar. So by that logic, I figured the world probably had some form of natural mixed gases as it seemed a basic enough idea without really putting anything in the world too far in question. However, if you'd like, I could find a way to change that into a "cause and effect" that makes more sense for the Re:Zero world.

Even if the party weren't effected, the checkpoint could still be close by, therefore letting easy access back to the group he was with(so long as he knows the way of course). 

Yeah, usually it wouldn't, but thats why he has the barrier stone the elf gave him. Its been keeping away nearby mabeasts from his location(both in the house and when he's traveling) so he's far safer. Not to mention, his skill with a bow has been helpful to make sure he doesn't get caught in physical combat with the animals he hunts. It's still dangerous, but overall, it's not as dangerous as it'd usually be due to these precautions.

As for the insanity, yeah I understand that. I figured, however, due to the large amount of time he's gone without dying(basically ever since his first few weeks in the cabin, he has yet to die again). He's ended up injured and heavily injured, but bounced back. I still see where you're coming from and I do intend on him having a few tokens of insanity(2 or 3? I'm not sure exactly how the rating would work).

[[@liferusher]
Got cha.