Something seems off on Draconic Force. Just faced a player casting it on Skeezick cannon and it was getting +4 damage for every nearby Skeezick.
This appears to be taint specific. I just play tested skeezick w/taint in skirmish and both my tainted cannon and tainted alchemist were getting +4 dmg from nearby skeez. I then play tested with draks and used consulates grant draconic force ability on a templar and he was getting + 2 dmg from nearby draks. I then tainted the same templar next round and he was getting +4 dmg. The taint rune text currently says it gives Regen 3 and Draconic Force 2. The hover over then gives a description of draconic force (with no 2 at the end) and says it gives +2 dmg per nearby dragonkin. My gut call is that "2" at the end of Draconic Force in the taint description is where the multiplier is coming from.