I've been doing research on the effect of Int on the spell damage for my Master 1 of Stroke.
The spell damage follows the formula:
damage = ((int * 0.3479) + base) * random#
- base = 295.52
- int = intelligence score
- random# = a random number between 1 and 1.353 (or so)
Another fact: I studied this as a level 62.99 Coercer (barely below level 63).
Update: I re-examined spell damage at level 63.44. The only difference is that the constant 0.3479 in the equation above changed to 0.343. See my discussion in Ego Burst for more information.
-Holman of Kithicor