@ Grek: Why not just.....stop using cerebral stones?
Those aren't actually the problem. The problem is that I just got access to third level breaches. The ones that I get, just for this one single level, do the following:
Impossible Strike - Deny Dex to AC for 1 attack, or do something stupid and pointless with thrown weapons.
Senses Beyond the Self - Scrying sensor of unlimited range, moving up to 360' per round.
Alter Scale and Size - Alter someone's size by +/- two size categories.
Enrichment of the Being - +4 to two attributes for an hour or so.
Destabilize Elements - 7d8 damage in a 20' spread out to Long range.
Form in Flux - I can become immune to poison, sleep effects, paralysis, and stunning, critical hits, darkness, starvation, thirst, and breathing. I also pick a +20 to land speed or gain a swim, fly, burrow speed.
Misplaced Hostility - All creatures within a 10' burst make a will save vs. trying to murder their allies.
Denial of Truth - Confusion in a 30' burst.
Remedy Bane - Cure ability drain.
Mind-Clearing Mania - Cause confusion in one creature while getting rid of all other mind-affecting effects.
Craft of the Damned - Create 7HD with of psuedonatural skeletons/zombies or 4HD worth of other corporeal pseudonatural undead such as vampires, liches, ghouls, wights, morhgs, etc. No max cap on how many I can raise at once, except the duration of the spell.
Obscure the Veil - [Death] effects completely heal the target instead of killing them; also they regen negative levels, ability drain/damage, etc. while under the effects of this breach.
I also get 3rd level incursion effects, which are:
Broken Tethers - penalty to ranged attacks out to 150'
Terminal Infection - Diseases within 3000' do ability drain instead of damage.
Crying Earth/Air of Excitement - A permanent Huge Earth/Air elemental appears at me every 1d4 hours. They start out indifferent and can be charmed.
Land of Fire/Frozen Heart -
All sources of Fire/Water within 3000' animate as Fire/Water elementals of up to Huge size. They start out indifferent and can be charmed.
This is on top of all of my breaches save DCs getting up to 30+ and having all of my wizard-like powers available effectively at will and casting two spells a turn. It's too much and unbalances things.