GWE: Chance for Psi Damage in a Psi damage power?
20% is the chance of the proc to trigger each time you activate the power, not the % of extra damage. But yes, it should work fine (the extra damage will show up visually as well as in your Combat log). I prefer using the Devastation chance for Hold proc in Blind which gives an additional Mag 2 hold 15% of the time (in addition to the 20% chance of a critical). This means that if you hit, you have almost one chance in 3 of holding a boss in one shot.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
The other thing with Blind is your chance of hold or chance of damage will also be applied to secondary targets adgancent to the primary target that are affected by the sleep.
It is possible that is also checks twice for the primary target, once for the hold and once for the sleep, giving you a better than 1 in 3 chance of holding a boss in one, or a chance of double bonus damage. I could be wrong about this though.
I think Okton is right about the hold being more effective. You would probably get a bigger damage increase by slotting an extra damage IO than slotting the proc, assuming you where also slotting the power for hold duration.
e.g. Blind as a damage power:
Acc, Dam, Dam, Rech, Rech, Chance of damage
e.g. Blind as uber-hold
Acc, Hold, Hold, Rech, Rech, chance of hold
(simplified slotting you do better with sets)
Hami-Os are also good with Blind e.g.
Acc/Dam, Acc/mez, Dam/Mez, Dam/Mez, Rech/End, Rech/End
I really should do something about this signature.
And as many have pointed out, a combination of (set) IOs/HOs can also be very effective. For example in Blind (with lvl 50 enhances):
2 Dmg/Mez
Essence of Curare Acc/Hold/Rechg
GWE Acc/Hold/Rechg
Devastation Acc/Dmg/Rechg
Devastation Acc/Dmg/EndRdx/Rechg
Gives you Acc 81%, Hold 96%, Dmg 96%, Rechg 81%, EndRdx 19% Sleep 67% in addition to 12% +regen.
If you don't mind slightly lower acc and rechg (or have some +rechg and +acc from other powers or set bonuses), you can even swap the last one for the Hold proc for an "uber-hold" with damage.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
Would this work, running up a sample IO build for my new Ill/Rad controler I have put GWE in Blind, including the Damamge proc, but how would it work seeing as Blind is Psi damage anyway (I think)? 20% extra damage?
Hawk