Inferno tactics.

I usually rule out Inferno because I don't know how to play with it or against it. For a long time, it was considered a terrible faction, but only because few people knew how to play it effectively. But after I got thoroughly beaten by players using it, I immediately added this faction to the list of overpowered ones, like Necropolis. It's essentially a gamble. If you start in a bad location with a terrible resource spawn, you can just give up. But if you get a good start, especially if you spawn near the top of the map, and everything goes well, your opponent will be in trouble.