EXP Zero (Super Soul Mini Pack)
There's quite a few mods out there designed to make leveling easier, getting you to max faster and stuff, but I don't think there's one out there for making leveling harder, or in this case, impossible, so I decided to fill that niche, inspired by Kingdom Hearts. As the title implies, these super souls give the player absolutely 0 experience to keep a character at level 1 (or whatever other level) to give a harder challenge.
There are 2 souls included: "EXP Zero" which is just 0 experience, and "EXP Zero +" which also gives a boost to all stats (health included) to give you an extra edge.
Download the Super Soul Editor below, go to Super Soul Options, click Import and select the .ssp file