Kill Morgott

To complete this square you need to defeat Morgott, the Omen King. Wait until the "ENEMY DEFEATED" or equivalent screen appears to mark the square.

To reach Morgott you need Capital access, which entails defeating two Great Rune bosses. This square has synergies with every square related to Remembrance bosses, such as 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.

Morgott counts as an Altus Plateau/Mt. Gelmir boss.