Siege Masters Discipline "Increase the power of your At-Will powers by 11%, this is double in stronghold". How i tested.
I unequipped all gear and companion bonuses apart from daggers that had no bonus effects.
I tested on target dummies
I play Rogue and tested using Cloud Of Steel and Sly Flourish.
I equipped a companion bonus that wouldn't effect damage output(level 750).
Results from Cloud Of Steel and Sly Flourish:
Normal hit - 1313
Deflected Normal hit - 889
Deflected Crit - 1366
Crit - 2019
I then unequipped the companion bonus that had no effect on damage output and equipped Siege Masters Discipline(also level 750).
The damage output was exactly the same. It is supposed to increase At-Will powers by 11%.
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Comments
That said, I have never been able to get a clear definition if what "increase power" really means.
So who the heck knows?
It works OK for me.
If you have a lot of +XX% damage bonuses it might not seem like it is doing its job, but it won't add +11% to your current damage IF you already have other things providing a +XX% bonus to damage.
If, for example, your base At Will attack damage is 1000 the Siege Master will provide an additional +11% (or 110) of that base.
If you also have a ring, some gear, Strength or Int bonuses, etc, that also add a percentage to damage, the siege master will combine with those to provide an overall +XX% to damage.
So, without any other bonuses your 1000 base attack will do 1110 if ONLY the siege master is providing a bonus.
IF you also have those other bonuses, say Attribute bonus of +3%, a Ring giving +5% and someone is running Drizzt with his flat +3%
that will also provide +11%.
So with those you get a total of +22%. Base 1000 + 22% (Total 1220)
You don't get: Base 1000 +11% (Running Total - 1110) +3% (Running Total -1143) +5% (Running Total -1200) +3% (Total -1236)
With bigger base numbers, Crits, and multiple +XX% bonuses these differences appear bigger, making people think that adding +% to damage provides "Diminishing returns", rather than simply "Buffing your damage bonus."
Gus Archer did some tests on this very companion a day or two back, and with some pretty basic set ups showed that Siege Master does indeed provide +11% on At Will Damage. NOT the Power Stat... Damage, caused by At Will attacks.
(Given the fact he couldn't remove the +% to damage he got from his characters Strength Attribute, he showed that the total is actually slightly higher than 11%)
His results are available on Youtube.
If it's genuinely providing NOTHING, you do have a bug and it needs reporting.
If it's merely not doing as much as you expected/hoped, that may be because your expectations were based on a false understanding of the mechanic.