Behemoth?

[Stavis_L]

The description doesn't refer to the caster not being able to cast spells, but rather the rider. Basically, it summons one undead elephant complete with undead rider who is technically/flavor-wise a mage (but who can't cast spells.) The summoner can do whatever you like afterward.

Not the most intuitive, and a lot of people ask.

[oldbone]

ahhh... that makes so much more sense - many thanks!