Monsters ignore -Cast

Wiglaf the Gunnerdwarf comes into view.
He is wielding a +0 battleaxe of electrocution, 
wearing a +2 plate armour of fire resistance and 
wearing the +4 hat of Calculation {-Cast Regen+ Str+5}.
_Wiglaf says, "Och, ye'r asking fur it now."
_Wiglaf mumbles some strange words.
_Wiglaf seems to grow stronger.
He has mastered the following spells, which are affected by silence and antimagic:

a - Might                                       b - Hellfire Mortar

It seems silence and antimagic affects Wiglaf’s spells, but he happily ignores
-Cast from an equipment…

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