| Plausible Pseudonym |
I'm not sure what's complicated about it. It's like regular spell turning except unlimited duration and no cap on the spell levels it can bounce back. Any spell that has a target line including an individual and is not a touch spell gets bounced back on the caster and doesn't effect the caster. Any spell that affects an area (e.g. mind fog or fireball) effects the titan normally. Any spell that creates an effect (like Disintegrate, which has "effect: ray") also affects the titan as normal. Any spell of range touch (vampiric touch, imprisonment, etc.) affects the titan normally.
If the caster also has spell turning up and casts a spell subject to turning you use the chart in the spell description.