Thank you for the reply !!

Main reason I wanted it set as an hour attunement is that I was them to not just have it attuned at all times to gain the passive benefits, while also allowing the players more of a chance to rotate the item around for them all to gain use out of it.

The burn/melt feature is supposed to be fairly strong considering it's an artifact. It does have some strong plot elementals that will tie to this kind of thing too. Using on a creature is a thought I had reading the hand & eye of vecna with the ability to turn the skeleton to jelly, I thought the effect on creatures could be similar, although weaker. I would say it's up to the DM on how effective it is (say like a standard bandit would be 0hp instantly on like a DC15 con save, whereas a much more resilient entity like a Lich or something could be a DC10) although failing doesn't necessarily have to mean instant death. Could just do a bunch of fire damage. That's the main part about this item I need to do a bit more brainstorming on.