Hallowed Wand - Wisp

Source
This wand has a chance to be contained in:

Related achievements
requires that you be transformed by each of the Hallowed Wands, excluding the random one.

Feign Death
It is possible for Hunters in Wisp form to use Feign Death in Wisp form to cause their wisp model to disappear in a 'pop'. Luckily, while in wisp form, it is not possible to attack without taking off the buff.