Before I forget, this is built off of the initial work done by u/MightyBobTheMighty as done here: https://www.reddit.com/r/ffxiv/comments/1dtc5p4/guaranteed_imperfect_trust_guide/ I copied his work and used it as the basis for my own so credit is due where it's due.

So lets go over the starting info:

We have 8 characters to level from 91 to 100

• 1 Tank (Thancred)
• 2 Healers (Urianger, Alphinaud)
• 4 DPS (Y'shtola, Estinien, Alisaie, Krile)
• 1 All Rounder (Graha)

Therefore our limiting factor will be our DPS, since we need to level everyone up two levels to reach the next dungeon (or in the case of Origenics, once to finish). That brings us to our next question: how many runs will it take to level a trust optimally?

Answer? 5 Runs. You generally need 3 runs to hit the even number of a dungeon, and then the remaining 2 runs to hit the next dungeon threshold. It varies but between the first 4 dungeons this is consistent. Origenics requires 3 runs to finish for DPS, but less for the Tanks/Healers. More on this later.

The next question is how should we split up our Tank(s), Healers and DPS. In case you're unaware, there's some unique interactions that different Trust members have with each other. There's two that I'm aware of that really matter in the long run:

• Thancred requires Urianger to use Cartridge Skills (aka more moves). Apparently you can use Y'shtola for this as well?
• Alphinaud will prioritize Alisaie over you/the tank. Alisaie has a tendency to charge in and be slightly more aggressive as well. She might take more damage as a result.

So from this we know two basic set ups we need to have

*Thancred should always be paired with Urianger. While there are set ups you could use to solve this with Y'shtola (if that works as well) only, in my runs i generally paired the 3 of them together so it doesn't matter. *Alphinaud and Alisaie should be separated as much as possible. Alphinaud (from my experience) has the worst healing AI, worst move set to bail you out of low HP, and generally struggles more than Urianger and Graha's Cure 2 Spam. We ideally don't want him getting distracted with his priority healing for his sister.

Lastly, what will you as the player need? Well that's easy. That's a question of what you'll want to level. I'm going to assume you don't want to waste experience, and are leveling your classes alongside your trusts for maximum efficiency. So to do this you'll need:

• 1 level 91 tank (Any, but PLD/WAR are probably better for Hallowed Ground/Self Healing, respectively)
• 1 level 91 healer (Any, but Pure Healers (WHM/AST) will be easier IMO)
• 2 level 91 Non Caster DPS. Preferably Ranged, or a Melee.

The reason for non caster is because we want to get the 4% bonus for bringing a varied party. Since we'll always have a tank and healer, that leaves us with figuring out which DPS we should bring for the bonus. 3 out of the 4 Trust partners are Casters (Alisaie, Y'shtola, and Krile). Therefore if we want to deal the maximum damage (4% bonus instead of 3% bonus) we should opt to not bring magic DPS. It's possible but to continue getting the 4% we'd need to always pair with Estinien for 5 runs, and then our remaining 3 runs will be split between another job. Inversely, if we bring a melee, we'll never be able to pair with Estinien (which would also work for my method, I just never did it). Because there's no Ranged Physical DPS (Lyna was the only trust iirc who ever was) we will never run into an issue if we play Ranged Phys. For my DPS slots I prioritized BRD then DNC for leveling, since they both bring party buffs.

I want to emphasize I have not tested this and it's entirely possible with how trust DPS is calculated that the difference between what DPS to bring, what comps of trusts/player job, and more is negligible. This is all speculation and ultimately this is not a speed running matter. Some of my runs were done on 7.00, 7.01, or 7.05 so some various job changes might have affected the speed (EG the PLD Buffs in 7.05 might have made my last few runs of Vanguard faster potentially). Your mileage may vary

Ultimately the choice of what DPS to bring is up to you, or even if you want to level multiple classes this way. The way I did it followed this line of thinking.

So lets get into it:

91 Dungeon: Ihuykatumu

• Amount of experience each run grants: 5,801,800
• To go from level 91 -> 92 trusts need: 13,659,000
• To go from level 92 -> 93 trusts need: 15,348,000

Total Runs: 14

As you can see, this will be our general set up for every run for the first 4 dungeons. For this set of dungeons only, we will level the tanks for our last two runs. After this, we will level the healers instead.

93 Dungeon: Worqor Zormor

• Amount of experience each run grants: 6,689,500
• To go from level 91 -> 92 trusts need: 15,912,000
• To go from level 92 -> 93 trusts need: 17,534,000

Total Runs: 28

There's a few things to note about Worqor Zormor.

• First off, the first pull after the first boss is very vertical, and I noticed that if you're not playing Tank and can force the AI to leash to you, they generally get stuck on the staircase and have a harder time healing or keeping line of sight with you. AI Alphinaud seems to struggle more with this, but even Urianger has a hard time keeping up with Thancred's health. Best bet is to just single pull these two mobs separately.

• Secondly, the second boss will require you to adjust if you're DPS. Sometimes the other AI DPS will run south to the healer during the boss's big attack with the aoes and most of the arena being covered, sometimes they'll stay in middle with the tank. Adjust accordingly and play it safe.

• Lastly, we'll start adjusting the order of priority for our trusts, those last two runs we will instead over level healers this time. The goal is to be done with non-Graha healers asap. Just trust me on this one.

95 Dungeon: Skydeep Cenote

• Amount of experience each run grants: 7718100
• To go from level 95 -> 96 trusts need: 18,263,000
• To go from level 96 -> 97 trusts need: 20,322,000

Total Runs: 42

97 Dungeon: Vanguard

• Amount of experience each run grants: 8,787,000
• To go from level 97 -> 98 trusts need: 20,957,000
• To go from level 98 -> 99 trusts need: 22,979,000

Total Runs: 56

Not really a lot of notes for Vanguard. You'll notice that our healers are going to not only hit level 99, but be very, very close to hitting 100 by the time we're done. Good. This is intentional.

99 Dungeon: Origenics

• Amount of experience each run grants: 9,012,200
• To go from level 99 -> 100 trusts need: 23,789,000

Total Runs: 62

Not many notes for Origenics either. A few pulls you can't big pull either, just gotta hit down a few enemies at a time. I'd also not big pull the two minotaurs with the tortoise at the end.

And with that we're done. As you can see, the tanks only needed two runs each to finish, but since we can change Graha to a healer you can tank if you feel more comfortable (feels faster too). Since we're only going up one level we need only 3 runs per every DPS to level them. We can forgo extra runs if we just accept the 3% and have two casters team up with each other.

Your reward for doing all this grinding will be:

• The Bound by Amity Achievement
• The "Goldheart" Title
• Custom, beach/tropical themed outfits for all the characters

And that's it! Hope this helps with planning out your runs. Again thanks to u/MightyBobtheMighty for the initial set up.