Cystic Magic (3.5e Feat)

Cystic Magic [Spellcasting] Your magic's messed up, dude. You just gave that guy magic cancer. Benefits: This is a spellcasting feat that scales with the highest-level spell slot you have.

• 0: Spells you cast can encyst the target, as per the Necrotic Cyst spell. In addition to this, you have a cyst of your own.
  This also allows you access to the necrotic cyst line of spells, if for whatever reason you didn't have access before. Necrotic Cyst Spells: 1st--necrotic awareness; 2nd--necrotic cyst, necrotic scrying; 3rd--necrotic bloat; 4th--necrotic domination; 5th--necrotic burst; 6th--necrotic eruption; 7th--necrotic tumor; 8th--necrotic empowerment; 9th--necrotic termination.
• 1: Spells that you cast on encysted targets benefit from a +2 to the DC for the save, as the cyst inside the target rather likes the magic you do and wants to spread its love the the host it's grown in. This is in addition to the already-extant -2 penalty to the target's saves the cyst gives. Share and enjoy!
• 3: Damage spells cast on encysted targets deal an extra die of damage of the type relevant to the spell for each spell level you can cast. That means a fireball against an encysted target with this feat would deal an extra 3d6 damage, increasing to 4d6 when you can cast level 4 spells, etc.
• 6: Damage spells cast on encysted targets cause the cyst to swell up from the magical energies you're feeding it, causing an automatic necrotic bloat spell to take effect in addition to the spell you cast.
• 9: Any encysted targets you slay with your magic automatically rise as skulking cysts under your control, because you're their mommy! You can control a number of Hit Dice of skulking cysts equal to 4x(Caster Level). Any skulking cysts raised over this amount still exist anyway and are generally genial to you, but you can't control them and they're gross.