High Magic
From Compendium of Worldly Lore
Needs review
Source: Quintessential Elf
Description: You have learned the secrets of Elven high magic
Prerequisites: 9th Level Caster
The character can suffer a temporary point of Constitution damage in place of one higher level slot to power spells cast with a metamagic feat. The lost Constitution points cannot be regained by any magical means; only rest will bring them back.