On levels three, four, and five, you will have to search for Memory Flux gates. They will spawn NMs; these are mandatory fights and required to proceed with the mission. The one on the third floor is a Propagator (Gorger type), on the fourth floor, a Solicitor (Craver type), and on the fifth floor, a Ponderer (Thinker type with AOE Sleep so bring poison pots). After you defeat each NM, check the Memory Flux a second time for a cutscene. Then heal up and search for the next Memory Receptacle.
If you have a Paladin tank, make sure they don't eat defense food when you're getting close to Ponderer. If it absorbs a Tavnazian Taco and Protect it is almost impossible to hurt with melee attacks.
Each time you get the cutscene, you’re given the option to warp to that Memory Flux from the gate in Pso'Xja. So, after you beat a Memory Flux, you can resume there later without starting over.
If you don’t defeat all three Memory Flux NMs and get the cutscenes at those areas, you will not be able to cross to the Web of Recollections within the Spire of Vahzl.
As with all Empty, their elements will be random. Make sure to note the bosses' elements so as not to cast spells that will be ineffective.
The Procreator can usually be tanked for some time when it's HP is high without having to fear bad TP moves or an invasion of the Offspring.
The next boss in the sequence will always aggro when the current boss is at 20% HP. Delay this mob with Terroanima and/or Bind/Shadowbind until you can finish off the weakened mob.
If your party has a full set of anima, use one Psychoanima/Hysteroanima pair at about 50%, and a second at about 25% on each boss. If you only have one set per boss, use it at 25%.
Watch out for Cumulator's Impalement early on. If it kills the tank, it's probably easier to leave the BC and try again.
Any OffspringProcreator spawns will die when it dies, so just finish it off to get rid of the Offspring.
Agonizer continues to be the strongest. Save resources (2-hours, MP, etc.) for finishing it quickly. Cast "dummy" buffs; use Poison Potions if you brought any.
The tank must not eat defense food until Agonizer is dead. If you have a Paladin tank, pulling Agonizer first allows them to use food for the other two bosses.
With a setup including two or more BLM it is possible to win this fight without using anima or 2-hours (a good setup example is RDM, BLM x2, NIN x2 and WHM because this setup minimises the TP gain of the ennemy). The strategy is to have the black mages both cast Freeze at 19-22% to kill the boss you are fighting, and have one NIN temporarily tank or a RDM Gravity kite the next one for a few seconds if necessary. It is better to use Freeze a little bit too late than too early, as the ideal is to make sure the boss you are fighting dies from the spells, then have the black mages heal to full in a safe corner and repeat the same thing on the next. Naturally if you have more than two BLM it is probably safe to start casting around 25%.
You will receive 1500 experience for winning the fight.
When the Spire battle is cleared, head out to Beaucedine Glacier and talk to the three Tarutaru in the tower at (I-7). There will not be a cutscene from the three Tarutarus, nor will the mission log change.
The Emptiness has trapped you and your companions. You must find them before you are able to continue your journey into the depths of Promyvion.