cmanos said:Ah so a regular potion of speed wouldn't work on a ghoul? You'd need something like a Potion of Undead Speed?
No, it is just that several spells will not help undead due to thier immunities.
sejis said:Heck, a golem can even drink a potion if they're built properly.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.