Linnea arrived in Genshin Impact's Version 6.5 as a Geo Bow user who fills the Sub-DPS and support role. She's already proving valuable in Lunar-Crystallize teams built around characters like Zibai, and the natural follow-up question for players who secured her at C0 is whether to chase her first Constellation or her signature weapon next. The answer depends almost entirely on how deep you plan to invest.
Quick answer: If you're choosing between one additional copy of Linnea (C1) or one copy of Golden Frostbound Oath (R1), the weapon is the stronger single upgrade — roughly an 11% team-wide damage increase versus about 5% from C1. The only exception is if you already plan to push all the way to C2, in which case pulling toward constellations is the better path.

What Linnea's C1 — Provisional Classification — actually does
Linnea's first Constellation, called Provisional Classification, introduces a stacking mechanic called Field Catalog. Casting her Elemental Skill (Countermeasure: Lumi's Battle Cry!) or triggering Moondrift Harmony grants 6 Field Catalog stacks for 10 seconds, stacking up to 18. Whenever a party member deals Lunar-Crystallize Reaction DMG, one stack is consumed to increase that hit's damage by 75% of Linnea's DEF. Additionally, when Lumi uses Million Ton Crush in her Ultimate Power Form, she can consume up to 5 stacks, with each one adding 150% of Linnea's DEF to the damage.
In practice, this translates to a personal damage bump that early calculations peg at around 5% for the overall team. It's a decent bonus, but it doesn't change how Linnea functions or open up new team compositions. The stacks are consumed quickly in fast-paced rotations, and the DEF scaling, while thematically consistent with her kit, doesn't move the needle dramatically at just one Constellation.

What Golden Frostbound Oath (R1) brings to the table
Linnea's signature Bow, Golden Frostbound Oath, has strong base stats at level 90: 542 Base ATK and 88.2% CRIT DMG. The passive provides a flat 16% DEF increase, which directly feeds into Linnea's DEF-scaling abilities. Beyond the stat stick value, the weapon carries two layered team buffs.
| Passive effect | Trigger condition | Buff |
|---|---|---|
| Frost Fae's Favor | Elemental Skill or Lunar-Crystallize hit lands on an enemy | +40% Geo DMG and Lunar-Crystallize Reaction DMG for the wielder (6s) |
| Frost Fae's Mischief | Moondrifts are near the wielder while Frost Fae's Favor is active | +20% Geo DMG and Lunar-Crystallize Reaction DMG for the entire party (works off-field) |
The 20% party-wide buff from Frost Fae's Mischief is the key differentiator. It lifts the damage of every teammate running Geo or Lunar-Crystallize reactions, making it especially potent in premium compositions like Zibai / Columbina / Illuga / Linnea. Early testing puts the total team damage gain from R1 at roughly 11%, more than double what C1 offers.

Side-by-side comparison: C1 vs R1
| Factor | C1 (Provisional Classification) | R1 (Golden Frostbound Oath) |
|---|---|---|
| Estimated team DPS gain | ~5% | ~11% |
| Who benefits | Linnea only (personal damage) | Linnea + all party members |
| DEF scaling | Adds DEF-based flat damage via stacks | +16% DEF plus CRIT DMG substat |
| Off-field utility | Stacks can be consumed by teammates' reactions | Frost Fae's Mischief triggers even when Linnea is off-field |
| F2P alternative available? | N/A (constellation) | Slingshot or standard banner 5-star bows work as substitutes |
| Banner risk | Character banner (50/50 → guarantee system) | Weapon banner (Epitomized Path, potentially two pities) |
The C2 wildcard
Linnea's C2 is widely regarded as her strongest early Constellation — a significant power spike that dwarfs both C1 and R1 combined. The general consensus among theorycrafters is that C2 alone outperforms having C1 plus R1 together. If you're a player who is willing and able to commit the Primogems (or cash) for two additional copies of Linnea, pulling toward C2 through the character banner is the more efficient long-term plan. Stopping at C1 without the intention to continue is considered a poor use of resources.

Weapon banner caveats
Golden Frostbound Oath is the mathematically superior one-purchase upgrade, but the weapon banner itself carries higher risk than the character banner. Epitomized Path guarantees the featured weapon you want only after a worst-case scenario of roughly two full pities. If you're working with a limited Primogem budget — say, fewer than 200 Fates saved — the weapon banner can be a painful gamble. Players who already own Chasca's signature weapon on the same banner and wouldn't mind a refinement there have a slightly softer floor, but that's a niche situation.
For budget-conscious players, Linnea functions well with Slingshot (a 3-star weapon) or a standard banner 5-star stat-stick bow. Neither matches Golden Frostbound Oath's team-wide utility, but they keep her viable without the weapon banner's volatility.
Illuga constellations as a tiebreaker
Illuga is featured as a 4-star on Linnea's character banner, and his constellations — particularly C6 — are extremely valuable in Zibai and Linnea teams. If you're sitting at C2 or C3 Illuga, pulling extra on the character banner for a shot at C1 Linnea while stacking Illuga copies can be a reasonable play. The 4-star constellation progress carries forward to future reruns, so even if you don't hit C6 Illuga now, you're banking toward it.

For most players, Golden Frostbound Oath at R1 is the single best upgrade you can make after securing Linnea at C0. It provides a larger damage increase, benefits every teammate in Geo and Lunar-Crystallize compositions, and works even when Linnea is off-field. Reserve C1 only as a stepping stone toward C2 — and only after your main DPS carries like Zibai and Columbina are already well-invested.