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The one whose talent materials you are short on for the characters you are actually building. Every weekly boss (Trounce Domain) drops three talent-level-up materials, and each character needs exactly one of them to raise a talent past level 6. The recommender adds up what your selected characters still need, subtracts what is already in your inventory, and ranks the bosses by the size of that deficit. A boss you have a surplus for is listed as satisfied at the bottom.

Per talent: 1 at level 7, 1 at level 8, 2 at level 9 and 2 at level 10 — 6 to take one talent from 6 to 10, 12 for Skill and Burst, and 18 for all three. Levels 1–6 use no boss materials at all. The tool lets you set a target per talent, so a character you only take to 8/8/8 is counted as 4 materials, not 18.

A weekly boss drops 2–3 of its talent materials per clear; the planner uses an average of 2.7 and rounds up, so a deficit of 6 shows as 3 runs. Your first three Trounce Domain rewards each week cost 30 Original Resin; after that they cost 60. Surplus materials from the same boss can be converted 1:1 with Dream Solvent, which the results mark as convertible.

GOOD (Genshin Open Object Description) is the JSON format used by Genshin Optimizer. Scanners such as Irminsul and Inventory Kamera read your characters, talents and inventory from the game client and produce one; Genshin Optimizer can also export its database in this format. Paste the JSON into Step 1. It is parsed in your browser and never sent anywhere.

Yes — all 14 Trounce Domains from Stormterror and the Wolf of the North through the Fontaine, Natlan and Nod-Krai bosses, with the game version each was added in. Bosses newer than the baked data are flagged as beta. Character-to-boss mappings come from the same data the game uses for talent costs, so a new character maps to the right boss as soon as the data is rebaked.

A full 1→90 ascension costs 1 Sliver, 9 Fragments, 9 Chunks and 6 Gemstones of the character's element — the same for 4★ and 5★ characters. Measured in Slivers that is 1 + 27 + 81 + 162 = 271. The planner only counts the ascensions a character still owes, so someone already at ascension 4 needs just the last two phases.

Two ways, and the difference is the whole point of this tool. At the crafting bench you can combine 3 gems into 1 of the next tier up (3 Slivers → 1 Fragment, 3 Fragments → 1 Chunk, 3 Chunks → 1 Gemstone) for free — but never the other way. You can also convert a gem of one element into the same tier of another element for 1 Dust of Azoth each. There is no way to turn a Gemstone back into Chunks.

Because gems only craft upward. If you own 30 Chunks but only 2 Gemstones and a character needs 6 Gemstones, the 30 Chunks can be crafted into Gemstones — but 40 Gemstones and 0 Chunks would leave you short on Chunks with no fix. Naive "total gems" calculators assume a downgrade path that does not exist. The planner resolves need tier by tier from Gemstone down, spending each tier's own stock, then cross-element conversions, and only then crafting up from below.

The planner runs twice: once on the characters you selected (can you reach 90?) and once with a reserve of extra full ascensions per element added on top. Whatever surplus survives the second pass is labelled safe to convert, so you can feed a new character of another element without silently starving a future one. Adjust the reserve to be more or less conservative.

Characters that still owe ascensions and rate S or higher on genshinRater's tier list. Planning gems for characters you will never build is noise, but you can widen the cutoff or tick anyone by hand. The Traveler is excluded: Brilliant Diamond sits outside the conversion economy and GOOD exports do not track it.