Paladin's can't gate.
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<br>Healers can gate. Maybe thief rid the title or the who list wrong and thought it was a paladin.
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<br>Conjurer's can open a group gate. Might have brought the paladin along that way and was just invisible.
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<br>Maran's have a power that they can gate as well, but it is very limited in what it can be used for.
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<br>And there is one questy item in the game that can let a player gate.