Elden Ring: How To Defeat Commander O'Neil
Commander O'Neil is a Great Enemy in Elden Ring. Located in the Swamps of Aoenia in Caelid, the boss stands endlessly in the Inner Aoenia, waiting for the fight with you. Upon entering the massive arena, the boss will do its summon animation, and the fight will commence. The fight can be tricky, especially with the boss summoning Spirits to help him.
Related: Elden Ring: Caelid Complete Walkthrough
As the area outside the boss arena is accessible during the fight, you can run away from the fight or take the fight to the swamps. However, keep in mind that you will be afflicted with Scarlet Rot if you decide to stay long enough in the swamps. Here is all you need to know about Commander O'Neil.
Commander O'Neil is located in Swamp of Aeonia inside Caelid. Fighting the boss is optional and will not affect any endings in the game whatsoever. Defeating the boss will get you the Commander's Standard (Halberd), which has a ridiculous reach and high damage output. You will also get the Unalloyed Gold Needle, which is a key item required for Millicent's questline.
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The boss has a number of attacks, most of which revolve around summoning spirits and casting buffs for them.
Summon Crossbowman/ Greataxe Soldier
The boss summons five Spirits at the start of the fight, who are scattered in the boss arena. Some of these enemy spirits have crossbows while the rest hold swords. After losing 50 percent health, the boss summons three soldiers who carry Greataxe.
Counter: The boss performs no attack in this animation, so you can get free hits.
Offense Spirit Buff
Commander O'Neil swings his Halberd and casts a buff increasing the Spirit's Attack. You can identify this buff by seeing the boss radiate red circles around
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