Religions
A number of classes are “locked” to those who practice a certain religion. In effect, these classes gain a Paladin-like restriction that requires you to remain an adherent (in some sense) to that faith. Generally, classic “divine” magic is restricted to members of the Faithful, “nature” magic is restricted to Animists and soulmelds are restricted to Ancestor worshippers. Arcane magic, such as it exists in The Hard Lands, has no restrictions whatsoever.