Dungeon is accessed by taking red crystal at entrance of Crystal Tower then entering ????? Gate where Ultima gate used to be.
** make sure to bring sizzle ability*
On first level at end there are 4 crystals, each has a path that must be cleared to unlock 5th crystal for Garland Battle.
1st zone inside each path has 2 crystals, one leads to desert which goes back to start, other leads forward.
front left gem = (fire route)
Lava floor = right front entrance gem = forest
Forest = linear path to crystal = goblin fortress
Goblin fortress = linear path to crystal = nebula cave
Nebula Boss = Marilith
Back left gem = (earth route)
Nebula cave =2nd gem (after jumping down ledge and up next ramp) = train graveyard
Train graveyard = linear path to gem = goblin fortress
Goblin fortress =linear path to gem = nebula cave
Nebula boss = Lich
Front right gem = (water route)
Sunken temple = left gem = docks
Docks = Linear path to gem = goblin fortress
Goblin fortress = linear path to gem = Nebula Cave
nebula Boss= Kraken
Back right gem = (wind route)
Dragon Scar = bottom right gem = crystal tower
Crystal tower = linear path = goblin fortress
Goblin fortress = linear path = nebula cave
Nebula Boss = Tiamat
Rear gem = (unlocked after doing other 4 routes)
Icicle Ridge= Linear path to crystal = underground prison
Prison= Linear path to crystal = Castle Exnine
Castle Exnine boss= 4 previous bosses + Garland
I was level 95 with stacks and level 80 bahamut and fight wasn’t to hard.