Talk:DRSP
This effect appears to be bugged. When the magnitude of the effect is 50 or smaller it works fine but whenever the magnitude is greater than 50 it will subtract 2^16 (65536) from the magnitude of the effect before applying it. The player's max magicka after applying a drain magicka effect of 51 or greater will then be: player_base_max_magicka + 65536 - drain_magicka_effect_magnitude. This bug is not limited to single effects - it will occur whenever the total of all drain magicka effects exceeds 50.
I noticed and explored this bug on a low-level Breton mage (with Lady birthsign) while testing a mod that would add sustained spells (similar to those in the game Dragon Age) to the game. I'm not sure if the Breton's racial fortify magicka effect makes a difference with regards to this bug - its possible that the cutoff value of 51 might be higher or lower for other races. TFM