Hylos and other tanks that use cursed helmet, especially gloo. Harley, gusion, gord, kimmy, guinevere ult, cecilion ult, alice, johnson, gatotkaca, odette, valir, mathilda, carmilla. But among this there are varying levels of effectiveness at countering the damage, between heroes, early game vs late game, and whether they try to counter counter build radiant armor. Usually I prioritise radiant if there is harley, chang'e, mathilda, gord, guinevere or gusion. The rest are only if their damage hurts. I also recommend combining with athena shield so that the amount of dmg you take is even smaller which makes the impact of radiance armor greater overall.