Source: Unearthed Arcana 81 - Heroes of Krynn

Prerequisite: 4th Level, High Sorcery Initiate Feat, Any Non-Good Alignment

Your ambition and loyalty to the Order of the Black Robes has been recognized, granting you these benefits:

• Ambitious Magic. You learn one 2nd-level spell of your choice. The 2nd-level spell must be from the Evocation or Necromancy school of magic. You can cast this feat’s 2nd-level spell without a spell slot, and you must finish a long rest before you can cast it in this way again. You can also cast this spell using spell slots you have of the appropriate level. The spell’s spellcasting ability is the one chosen when you gained the Initiate of High Sorcery feat.

• Life Channel. You can channel your lifeforce into the power of your magic. When a creature you can see within 60 feet of you fails on a saving throw against a spell you cast, you can expend a number of Hit Dice equal to the level of the spell. Roll a number of Hit Die equal to half the number of Hit Dice expended (rounded up) and the damage the triggering creature takes increases by an amount equal to the total rolled of those dice.