Kara'hol's curse change

Changed the negative effect of Kara'hol's curse. Instead of the hold effect after the spell ends, the spell now causes the caster to take 20% more damage for the duration of the spell. Damage output is unaffected. This will hopefully make the spell more balanced vs purge as it doesn't lock down the caster with the hold effect, and it might even be in the Shal's best interest not to purge someone with this spell up (gort and such notwithstanding, I know there are more issues to look at).