To reduce lull critical failures. If your corpse is in the bottom of some dungeon and invis or IvU don't get you there safely because of see invis mobs... You have to Lull the mobs to walk by them safely.
With low CHA you are more likely to have the mob aggro you when the mob resists the spell. This is bad when you're naked.
If your corpse is easily recoverable, this isn't an issue though. Basically that suggestion only applies in Sebilis or Howling Stones.
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