[1.7 beta1] Lord of Skulls and graphics

[Erenion]

Lord of Skulls has some interesting graphical interactions.
First, if a Lord of Skulls uses Bone Armour, their sprite will be in front of the shield granted by Bone Armour.
Second, if you cast Lord of Skulls on a skeleton that currently has Bone Armour active, they will retain the shield bubble graphical effect when the shield wears off.
EDIT: Surge of Undeath will remove the Bone Armour graphical effect if it lingers on a Lord of Skulls.