Phantox

I was some sort of water monster in a very tall cave filled with water. I terrorized the area's humans enough that they built an army to kill me. I mostly stayed in the water, killing humans and their ghastly-looking creatures.I fought so much that I almost got killed, which made me return to my base which was close by. A strong monster made it into my base but my base guardian managed to kill it before it got harmed.