Not sure if anyone's done of these for VX yet D2Modder, but I wrote one of these for RMXP awhile back. You can take a look at how it worked and port it over quickly if you're familiar with RGSS
http://www.gamebaker.com/rmxp/scripts/e/level-drain.phpThe instructions aren't uploaded, but it's basically this:
CODE
LevelDrainDeath = false
LevelDrainStatus = 17
LevelDrainAttacks[3] = 25
LevelDrainAttacks[4] = 1
LevelDrainSkills[16] = 1
Status = state added to characters once they've been drained
DrainDeath = kills a character at level 1 if true
"LevelDrainAttacks[4] = 1" Monster #4 will drain 1 level when it hits something
"LevelDrainSkills[16] = 1" Skill #16 will drain 1 level when it's used on something. Can be both good or bad, extra penalty for using skills if it's player cast
CODE
sg_levelrestore
Call script that restores all lost levels. Some other options in the script itself