Wearer cannot be charged or shot at unless enemy first scores 6 on a D6. Spells can only be cast at the wearer if the attacking wizard first rolls 5 or 6.

Skaven Assassins only.

Note that the dice roll made to charge, shoot or cast spells at the character is a test to determine if he has been seen. If the test fails then the enemy has not detected his presence and so cannot shoot, charge or cast spells at him. This doesn't prevent the enemy choosing a new target and the enemy hasn't spent his shot, failed his charge, or wasted his spell.