The healer is able to use their shield as their spell focus and it is imbued with magical resistance. The healer’s shield becomes a wall of faith, and the channel of their power. The healer may now cast without referencing their spellbook. A good effort should be made to affix representations of the healer's spell on the back of their shield, and casting time remains the same, and players must recite invocation lines. If a magical effect would cause your shield to be destroyed it remains intact. All other spell effects still apply. Shield is still vulnerable to non magical skills and abilities that destroy shields.