Poseidon's Guardian

Overview

When fishing multiple times in the same area, there is a chance for Poseidon's Guardian to spawn. This will be a mini boss type mob who's goal is to serve as a deterrent for afk fishing. The Guardian is a Drowned with an iron sword possessing a good amount of health. When he is killed, the person will gain a certain amount of redeemable exp to put into any skill, thus making it a worthy kill since you could even put the exp gained into the fishing skill.

Thoughts as to why

Fishing (especially in 1.13+) is extremely OP and can quickly ruin a server's balance. On an SMP I played on, I afk fished for two nights and got 2 mending books along with a lot of other really OP enchants removing a lot of the struggle and actual gameplay out of the game for me. While server owners can remove the ability to AFK, I figured including a counter native to McRPG would also be nice. While mcMMO had its Kraken, it was more of an annoyance than anything with no real reward. The Guardian would be a slight time consumer but would be fairly easy to kill (thus why I chose a Drowned over an actual Guardian mob since those can be hard to kill early game). At the same time the redeemable exp pay out from killing a mob would be equated to the same as successfully fishing multiple times. So while people would have to be on the lookout and not die from being afk, it would be a worthwhile trade in the long run.