I think the idea of an underwater pvp map/world in general would be interesting. Considering the nature of skyblock, it would definitely add purpose to tridents being present in the /fish shop beyond "look at my pointy three-pronged fork".
IGN: Solstice_X
Discord: Solstice_X#3901
Server: Skyblock
Favourite Christmas Memory: Masterchef-esque cook-off that happened a few years back with a friend's family and cousins.