So I will share my experience beat 3 GGC with ULTOR Lily(friend). Note: ULTOR breaker lvl 90 SBB10 guardian cloack and Lily Anima/lord lvl 100 SBB9-10. You need Migration unit (Darv and Narza recommended). Narza will help you protected from paralyze (eze dung) if you didn't hve status cure. Items: Fujin, Fujin, cure/high, Goddess idol, Rvve light

Vargas GCC : * ULTOR lead * Lily friend lead * Mariudeth maxlvl SBB4 * Rowgen lvl33 SBB10 * Elimo maxlvl SBB10 * Narza maxlvl BB4

First stage use Fujin on ultor use sbb. kill lancia first then galant then Leon and Vargas the last because he drop Atk and def at last. Sometimes your ultor will die (RNG) so you can use idol to him. Second option is Fujin on ultor and narza (it will more save. I only use 2 Fujin during this GGC) run the same circle and heal they will hit ultor till the end.

Second stage same as first becareful of agni because he will buff attack and may kill ultor (revive or idol). Easy stage run the circle

Last stage run the circle ULTOR SBB migration lily SBB and heal after hit.

Lance GGC For this I only swap the hitter Rowgen with Virsha. I do the same run. Lance is easier than Vargas. he not hit so hard and often. Good luck.

Eze GGC The hardest for ultor I swap elimo with rashil (Tia recommended for this, but rashil give crit buff) swap mariudeth with dilma. Rowgen up lvl 50 with Vargas sphere.

The first stage run the circle( rvive and idol may needed)

The second stage becareful of emilia bcz she hit hard even after ultor SBB guardian cloack. If you pass this stage the next will stable.

The last stage. This stage should be stable. Ultor migration is a must. Eze will hit aoe 4/5 so the single attack will hit your ultor with 1 damage. Then heal (full heal please) run the circle and hit as hard asyou can. (healer and lily should guard if not heals) (I kill eze after he revive with dilma lvl 93 SBB10)

Hope this will give you who didn't beat GGC yet an inspiration.