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Right now This 1 point Mastery has no Use in dominion. Wouldn't it make sense to have it affect capture rate?
Siege Defender should now increase the capture rate of any enemy capture point that you are near, and it should decrease the capture rate of any allied capture point that you are near.
The problem with Priscilla's blessing was that if multiple people had it and channeled on a point it would stack. This talent won't stack with other people who have the talent (like in Summoner's Rift).