The Cantrip Caster [PrC]

[Milskidasith]

That still doesn't make it less broken by RAW; saying "don't use cheese" when you post an ability that's only use is metamagic cheese (unless you really want to just cast a weaker spell for some reason) is not enough. That's like saying "Epic spells must be approved by the DM" makes them balanced.

Even the intended uses are terribly broken. Free metamagic add ons for minor losses aren't worth it. Even with your overhaul, Minimized Magic Missiles deal 1.5 less damage per die, and have two free metamagics applied to them, so essentially a free Fell Drain. This is in a level 1 slot. Add in Twin Spell and you've got two*number of missile* negative levels on one foe, and with even one other metamagic reducer it's still a lower spell so it can be auto quickened with Speed III.

So, with Arcane Thesis (Magic Missile), Speed III, , minimize spell, twin spell, and Fell Drain, for your third level spell slots you can throw out 20 negative levels, per round, each dealing 2 force damage and autohitting, and this is using two third level spell slots. That's nuts. You kill anything at your level, and even if you can *only* hit a person with one negative level per casting, you're still giving 5 foes -4 to everything and making them lose their spell slots. EDIT: This also assumes Arcane Thesis doesn't work on lesser metamagic, in which case you can also freely repeat this in a fourth level slot, meaning it's 40 negative levels per round, as long as the target is still alive, which is unlikely.

What do I have to do to convince you that kind of abuse is broken? At CL 20, you are throwing out 20 autohit, auto negative level attacks per round in a third level slot. You can get CL 20 at around level 16 (with arcane thesis), which means you can one shot BBEGs (or just make them cry when they don't have any good spell slots. You can do many other metamagic effects, too, if negative levels aren't working (Anything with damage + a save or die becomes Minimal damage + lots of SoDs).

Also, how does Lesser Metamgic interact with higher level spells? If I have 7th level spells, could I prepare a Minimized Time Stop?