Improved Wisdom Casting

[atan59]

After spending some time with a dwarven miner/crafter character (warrior-defender-enchanter), I'm now trying the almost opposite : an elven priest/ranger specializing on wisdom casting.
I've raised wisdom quite a bit, through base points, Divine Blood and items, and lowered spells cost a bit thorugh the Channeling ability. I've been doing fine casting only spells whose final cost is less than my character's wisdom, so have 100% success rate. I have yet to buy the ability "Improved Wisdom Casting", but I don't understand the description well. I'm interested mainly in 100% success rate spells. The description says "the casting strength will also increase, allowing you to cast more spells for free", but automatic success is supposed to be only when "Wisdom >= spell's cost". Will that change through this ability (as an indirect consequence of casting strength increase)?

[Variaz]

Thanks you for reminding me that the wisdom casting formula needs to be changed in the upcoming 0.5! ;D It really needs to be simplified to be more understandable.

It allows "free spells" in the sense that a successful wisdom-casted spell costs 0 mana, and it will happen more often with this ability, though it does not guarantee 100% success rate.

[atan59]

Thanks! That clarifies it a lot!