Wraithform [Ravenloft]

Upon casting this spell the target becomes shadowy and ghostlike, its eyes glowing a sinister red. This spell otherwise functions as the spell gaseous form with the following adjustments.

• The target can move at their regular speed.
• Any undead with an intelligence lower than 10, ignores the character, assuming that the affected target is a wraith or some other form of spirit and therefore doesn't pose a threat.
• The affected target gains +10 to any ability checks made to pass off as a spirit (either to intelligent undead or any other creatures). Creatures that see this form will react in a way corresponding to their nature (as determined by the DM).