http://scpsandbox2.wikidot.com/glatoiyar here is the new and slightly improved, added-on SCP
I'm not saying nix the raging, but it needs more. There are several ways you could take this. You pretty clearly know what his deal is, and why he is doing this, but you haven't informed the reader. There's a story there. You don't have to tell it directly, but you could hint more at it. And, if that story isn't interesting enough to add some extra individually to this piece, you need to transform or expand it. You either need to make this guy much more or much less human, in my view. (Edit: Like, mentally less human, not physically.)
If you go the human route, we need to see more of his personality and personal history. Going the alien route… is potentially more interesting, but also tricky to navigate. If you've got a murderously violent corpse with alien motivation done too shallowly, it's Able, but it being a destructive human corpse is going to make it difficult to make it as alien as, say, SCP-2361. Looking into history can help, and I definitely recommend it, if only to find some more interesting swords to mention. Digging into middle eastern/biblical/Mesopotamian stories might be iffy, because there's already the problem of seeming like Able, but there's plenty of world mythology to dig through.
Ultimately, right now you've got one story thread present: There's a corpse that doesn't like sulphur and destroys buildings. Everything else is hidden or very slightly implied, but not enough to tease out. You definitely need more narrative threads and detail, and that's going to come from fleshing out this person/thing's motivation. I think it could work in spite of similarities to other things, if you make that story interesting enough.