Mana loss when deleveling may be less than the mana gain when you re-level

[snellers]

If a char dies right after leveling, there's a chance they will lose a level due to how xp loss is calculated and the "delevel" feature the mud has. When they delevel they lose some of their max mana pool. But upon releveling again, they get a standard amount, which can be slightly more than what they lost. Thus, if you intentionally die/delevel/relevel, a char can boost its mana pool beyond what should be permitted.

More generally, the whole delevel feature is pretty questionable. Removing it would solve this problem instantly. Furthermore, chars lose quite a lot of Xp when they die, it is arguably a bit too harsh. So we should review this.