The Onion Knight

The Onion Knight is a Celestial Weapon, and it is the most powerful weapon for Lulu in the game.

You must obtain the Celestial Mirror before you can obtain or create any of the Celestial Weapons. Use the link below for more information on how to obtain the Celestial Mirror:

Celestial Mirror
Celestial Weapons

Using the Celestial Mirror in Macalania Woods

How to obtain the Celestial Mirror, which you can use to create each of the Celestial Weapons.

To create the fully powered-up Onion Knight, you will need to obtain the Onion Knight weapon itself first, then use the Venus CrestMars Crest and the Venus SigilMars Sigil to power it up.

Game Version Differences

Note that the Onion Knight requires the Venus CrestMars Crest and the Venus SigilMars Sigil to power it up in the PlayStation Xbox Nintendo Switch version of the game. In the Xbox and Nintendo Switch versionsIn the PlayStation version, these items are swapped for the Mars CrestVenus Crest and the Mars SigilVenus Sigil. You can change the active version using the Game Version toggle in the sidebar menu. Refer to the Celestial Weapons section for a full breakdown of the differences.

Obtaining Onion Knight

You can obtain the Onion Knight after you have defeated Geosgaeno near Baaj Temple. A treasure chest will appear in the southernmost portion of the water. Check out the Baaj Temple side quest page for more information on how to defeat Geosgaeno:

Baaj Temple
Side Quests

Enter the Baaj Temple to obtain the Onion Knight weapon.

Venus CrestMars Crest

You can find the Venus CrestMars Crest in Guadosalam in the Farplane. You can obtain it as soon as Maester Seymour leaves Guadosalam during a regular playthrough. Travel back to Guadosalam and enter the Farplane. You will see a treasure chest on the left side of the screen. Open it to receive the Venus CrestMars Crest.

The treasure chest in the Farplane that contains the Venus Crest

Venus SigilMars Sigil

To obtain the Venus Sigil, you must travel to the Thunder Plains and dodge 200 lightning bolt strikes in a row. This side quest is also known as the Lightning Dodger side quest. Use the link below for more information:

Lightning Dodger
Side Quests

Obtaining the Lightning Dancer Achievement/Trophy after dodging 200 lightning bolts

Tips and tactics for dodging lightning strikes in the Thunder Plains to obtain the Venus SigilMars Sigil for Lulu’s Celestial Weapon, Onion Knight.

Return to Macalania Woods to the area where you received the Celestial Mirror once you have obtained both the Venus CrestMars Crest and the Venus Sigil. Offer the Onion Knight up twice to fully power it up using both the Crest and Sigil.

Lulu charging up her ultimate weapon, Onion Knight, in Macalania Woods

The Onion Knight has the following abilities when fully powered up:

Break Damage Limit - Allows Lulu to do more than 9,999 damage in a single attack.
Triple Overdrive - Charges Lulu’s Overdrive at triple the speed.
Magic Booster - Uses more MP to heighten the power of Lulu’s spells.
One MP Cost - Causes all of Lulu’s spells to cost 1 MP (which negates the downside of the Magic Booster ability).