Board Thread:General Discussion/@comment-24749544-20171023125915/@comment-4524210-20171111024752

Monsters not fated to die at Ragnarok cam die at pretty much any time.

Those fated...I have seen that handled different ways in other Norse books. In one, such beings like Surt are impossible to kill except under their fated circumstances. At best they can be badly injured and locked up. Other times, such beings have a resurrective immortality. They can be temporary "killed' like the PJO monsters, but iwll eventually reform.

Fenrir claimed that he could not die until Ragnarok. Slitting his throat would have no effect. So my guess is those fated to die at Ragnarok are truly immortal until that even. Severely injuring them may inconvinence them for a while only for them to eventually reform and return.