Hell Squid is like a normal Squid but it spawns only inside lava at Hell dimension. These mobs is very usefull because when you kill it, it drops an enchanted book with random enchantment. The level of the enchantment depends on player level who killed it. IF you are above level 50, you will get more powerful books.

 

Simplifier mod has a tool/weapon called PUT (Powerful Ultimate Tool), and some enchantements can only be done using enchanted books. Use these books with your PUT and an Anvil to enchant the PUT with all enchantments that you need to a sword or tool, and make your PUT very strong!