Kill Radahn without summoning NPCs

For this square, you must defeat Starscourge Radahn without calling the help of any NPCs distributed around his arena. That is, only you should fight Radahn, with weapons and spells of your choosing.

There are multiple synergies associated with Radahn, one of the most commonly fought bosses in a bingo match as many objectives are only obtainable after defeating him, such as the Ghost Glovewort Bell Bearing (1), the Mimic Tear fight, and some of the Legendary Summons.

Besides that, there are synergies with all the squares associated with Remembrances: Acquire 3 Remembrances, Kill a Remembrance Boss with Bow/Crossbow Only, Kill a Remembrance Boss with a colossal armament only, Kill a Remembrance daggers, claws, or fists only, Kill a Remembrance with a Remembrance weapon only. Radahn also counts as a boss riding a horse.

Starscourge Radahn counts as a Caelid/Dragonbarrow boss.