Hyperion's power gain buff
If you don't use specific champions (Scarlet Witch, Hawkeye) against Hyperion, there's nothing that you can do if his PI is twice higher than yours. Then come a lot of Hyperion fanboys saying that "you have to learn to play" and else. Don't come recomend Magik and Civil Warrior, by the time you get enough power for E2, Hyperion will already be at his second E3 - if your champion is still alive, though.
I did three battles against a member of my alliance that got Hyperion and to check it out that his power gain buff is really overpowered. In those tests, I didn't try to hit him. So, all the power he gained was by himself from his own buff. Results: the lowest time Hyperion could reach E3 was 20 seconds (in this time he was even capable of using E1 once). I DIDN'T EVEN NEED TO HIT HIM AND HE DIDN'T HAVE TO HIT ME TO HE REACH SPECIAL 3 AT 20 SECONDS. Within 20 seconds it is impossible to win him as Alliance War Boss. Battling him normally is a pain because you hit him a little and all of random he activates the power gain buff, then you push back to force him to use his special 1 or 2, if he uses it is okay, but if he doesn't and he activates power gain buff, then you're screwed.
Hyperion's power gain is broken. This is a fact. Kabam, you have to nerf his power gain. Players are wasting too much on units to recover champs to defeat him in AQ maps and he alone decides a war depending on where he is placed.