For added context (because I kept being told that the post didn't follow "guidelines" but there wasn't anything bad about it) the idea is for it to be a raid based around the Tzhaar, with 5 bosses including an intermittent room in the middle that serves as a combat-gauntlet for supplies. Other items for drops could be considered, but I wanted to heavily base this around the Crush attack style.
#Suggestion: The Obsidian Crucible
west ore
viral yew
Not really sure how much sense it makes to talk about raids 5 when we dont even have raids 4 yet, it will be many years before we see that. Also probably overlaps with raids 4 rewards since that will in all likelihood be crush based already, it doesnt even make sense to talk about gear rewards at this point, all of what you suggested might be completely irrelevant in 3-5 years. Also so far Jagex seems to have picked raids themes completely on their own with no community input. Last point, with the Karamja Volcano already housing Fight Caves, Inferno and Jad challenges i dont really see the desire for another high end piece of content there, plenty of new and fresh things to explore instead
west ore
Not really sure how much sense it makes to talk about raids 5 when we dont even ...
Never mentioned Raids 5, could be taken as Raids 4 (unless a Raids 4 has already been confirmed as to it's theme) and I agree that Karamja Volcano already housing a lot of content already makes other areas more eyetaking to get attention to. Maybe could be Elven then, I like the theme and premise of The Gauntlets aesthetic, a raid around that theme would also be cool. I primarily chose The Obsidian Crucible w/ that sort of aesthetic due to just loving how the Fight Caves and everything visually looks, and could also introduce cool looking bosses as well. But, cool factor aside, I can agree it might be better away from that area
viral yew
Haha yes Raids 4 already has a theme... they announced it at the winter summit and are probably completely done with most of the lore, environmental design and boss design, they even talked about rewards already. And they have been designing it for well over a year already so you are a bit late to the party on that one