White Wyrm does NOT cast magic after adding armor ignore.

[Mandrake of DF]

Upped my white wyrm on origin, and after I added armor ignore it does not cast any magical spells,

WW is a magical pet, - so it is its first offence and defence.... now it dont use it. @Bleak

 

[PlayerSkillFTW]

It should be still using Magic, unless you added Armor Ignore via Piercing or something. The more Magic Abilities/Special Moves/Abilities a pet knows, the more it'll diversify it's "casting" AI. Give a Fire Beetle nothing but the Inferno ability, and it'll spam the hell out of it. But give it AI and Frenzied Whirlwind as well, and it will cast Inferno less often.