Undead Control: This potion in effect gives the imbiber the ability to charm certain ghasts,
ghosts, ghouls, shadows, skeletons, spectres, wights, wraiths, vampires, and
zombies. The charm ability is similar to the 1st-level wizard spell, charm person. It affects a maximum of 16 Hit Dice of undead, rounding down any hit point
additions to the lowest die (e.g., 4 + 1 equals 4 Hit Dice). The undead are
entitled to saving throws vs. spell only if they have intelligence. Saving throws
are rolled with -2 penalties due to the power of the potion; the effects wear off
in 5d4 rounds. To determine the type of undead affected by a particular
potion, roll 1d10 and consult the following table:

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