[Cerek]

Originally posted by Variol (Farseer) Elmwood: Hey, I want Aerie to cast Otiluke's RS on herself but she keeps saving vs spell. How do I make her not do this? The point of the spell is to protect yourself.

While Otiluke's Resilient Sphere does protect the target from being harmed by any outside forces, it also prevents any spells from being cast by the target inside the sphere. The sphere acts as an impenetrable barrier - keeping any energy or spells from traveling in to or out from the sphere.

Since a mage cannot cast spells out of the sphere, the game probably treats it as an adverse spell - thus granting the target a Saving Throw to avoid being "trapped" within the sphere. Unlike PnP, your character doesn't have the option to deliberately "fail" a Saving Throw.