Slow

[omledufromage]

 Keywords: 'Slow'
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   Syntax: cast 'slow' <victim>

   Despite popular mythology, slow is not the opposite of haste, but is a spell
   with it's own unique set of effects. When cast on an unfortunate victim,
   it slows its movements, making it easier to hit and reducing its rate
   of attack. The effect of slow also double movement costs and halve healing
   rates, due to reduced metabolism.

It says that the effect of slow halves healing rates. But everyone in game says that it makes you heal faster... so or there is a mistake in help file, or everyone is wrong.