Rune Of Oath And Steel

Anvil of Doom
If this bound spell is cast with a casting value of 7
or more, the target friendly unit may re-roll any
failed Armour Save rolls. If this bound spell is cast
with a casting value of 11 or more, the target
friendly unit may re-roll any failed Armour Save
rolls and improves its armour value by 1 (to a
maximum of 2+) This spell lasts until your next
Start of Turn sub-phase.