I am suggesting the MCMMO plugin for a Skyblock world. This would add the level system and skills per items, and also Salvage and repair, which is very useful.
Before you say this is a faction plugin, think about what it would do to add to a world. I'm not particularly familiar with this plugin, but I am 99% sure removing part of the plugin that has anything involving factions wouldn't be too too hard.
I would also like to suggest some custom mobs that drop diamonds, iron, gold, etc. They would be boss mobs, and very tough to defeat, but not too hard that it is impossible.
If the custom mobs are accepted it would be smart to add a single arena for just custom mobs, that are teleport-able? Or maybe just add a bedrock hole in the spawn that people can rent for a certain amount of time/tokens.
