Is there a guide to power interactions, what they are, and what they do? If so, can you link it here please? Thank you
Not sure if there is a guide for them but if you read the tooltips for each power they should correctly imply if they inflict a PI or benifit from one.
Power interactions differ depending on the powerset. Many of the guides from the old forums have been repost it in trhe Oracle Database, you might wanna check there.
That link above is GOLD. I used it to up my teammates damage when I troll with either gadgets or mental as I get a ridiculous number of power interactions depending on what powers I put in my loadout. If you team with the same people all the time, you can really start to make you loadout more complementary to them (luv electrifying mobs for my elec teammates...HUGE damage/heal buffage goin on).