| dragonhunterq |
It can't affect fine/diminuitive swarms in any event as it is weapon damage, and there isn't anything to over-ride that immunity.
Against tiny swarms expect table variation. I can see the argument that it is an area effect, so it should affect them, but I would expect resistance because it isn't spelled out in those terms anywhere I can find. Maybe some other guru will have better luck.
If it does affect tiny+ swarms you will get a single attack with no precision damage doing +50% damage (as a swarm counts as a single creature).