How to Get the X-18 Core

G-Toilet X-18 unlocks when three cores are in your inventory: X-18 Core, Green Energy Core, and Energy Core Base.

Fandom’s X-18 page, revised 18 Jun 2026, gives both a fraction of 1 in 4,000 and a percentage of 0.0025%. Those two published values disagree: 1/4,000 calculates to 0.025%. The source also lists a weekend fraction of 1 in 3,000 (about 0.0333% by calculation). No second independent rate source was found, so neither conflicting weekday value is presented as confirmed. The three cores are separate items; Green Energy Core is not an upgraded X-18 Core.

A public page does not record a despawn timer. Trello says the unlock needs all three cores in inventory, which is the same place Fandom files them after you pick them up. I will not answer “do they despawn?” with a yes or a no. Grind notes from videos favor repeating early zombie waves, including solo, and they say weekends are kinder. Those videos are from Nov 2024 and Sep 2026. The rate itself is the wiki’s.

The unlocked unit is listed at 10,000 HP with a frenzy bar, overpower consumption, an eye or core laser, and a gun mode. That combat card is not required to understand the drop.