Champion of Terraria

The final boss, arriving one minute after the fourth pillar falls (Star Destroyer) - or on demand later via a Celestial Sigil. The fight is an endurance test against the eyes: dodge the Phantasmal Deathray sweeps, kill the hand and forehead eyes, then the chest. A long asphalt runway, a heart-lantern/campfire corridor, and the Vortex/Solar/Nebula/Stardust armour of your class carry it. The nurse-in-a-box strategy remains the classic crutch, and no shame in it.

Victory drops Luminite and a class weapon from the best loot table in the game - and opens the road to Infinity +1 Sword. World complete; hats off.