Beat Radahn without summons using his phase transition window

Starscourge Radahn is one of the hardest fights in the base game but has a consistent phase two trick. In phase one, stay on Torrent, orbit wide, and bait his gravity boulder throws — they are telegraphed by him raising both hands slowly overhead. Each dodge away gives you a free hit window on his flank.

Phase one ends when his HP hits roughly 50%. He flies into the sky and crashes back down in a meteor strike. This is not a cutscene — you can dodge it. As soon as you see him rise, sprint directly toward where he was standing. His meteor lands on your original position, not behind you.

Phase two: he gains a gravity AoE slam and his sword range triples. Stay mounted on Torrent, bait his running slam, then sprint past his weapon arc. His hitbox on the slam has zero tracking once the swing starts. Dismount only when he staggers after a jump attack.

The fight becomes easy once you stop treating it as a melee duel and use the entire arena. The map is enormous specifically to let you kite him indefinitely on horseback.