Cauldron of a thousand poxes

This works exactly like a Screaming Bell, with the exceptions noted below:

• The Cauldron can be fielded only with a unit of Plague Monks. The unit never loses its Frenzy, even if defeated in combat, so long as it is with the Cauldron.
• The Cauldron is not used in the Shooting phase (ignore the Ringing the Bell chart), but instead allows the Pontifex to cast the Plague spell once in each Skaven Magic phase exactly like a Bound Spell item. If it is hit by a Strength 7 weapon and passes its Ward Save, the Cauldron suffers no further effect.
• To determine the Power level of the Plague, the Pontifex can decide how many dice he is going to roll: one, two or three. The total of the dice rolled is the Power level of the spell for that phase. If a 13 is rolled, the Plague is Irresistible! If the dice rolled include a double or a treble result, the Pontifex and the unit pushing the Cauldron will suffer exactly the same effects as those caused by a double/treble result when ringing the Screaming Bell (representing the Pontifex losing control over the virulent poxes of the Cauldron).