[Powers] Dark Sun defilers and preservers

[Justaguy]

Ok, this is the new defiling ability:
defiling ER (arcane magic; special recharge: defiling, -70%) [1] + very fast regeneration 1 (defiling ER only, +0%; temporary disadvantage, lifebane, -10%; PM defiling, -15%; accessibility, requires vegetal life in a 3-yard radius, -20%) [55].
And a new question: does anyone have an idea how to lower this cost?

Additionally, I found another mistake in the compartmentalized mind formula, I consulted Psi Powers p13-14, which handles some of the issues. It should be:
compartmentalized mind 1 (PM defiling, -15%; limited, one ability, -30%; mentalism, -10%; no mental separation, -20%) [13]. The caster will only be able to use his defiling while casting spells, as I had in mind.