Noelle build recommendations
It's recommended to avoid building a DPS Noelle if she's not [C5+].
Noelle DPS is best optimized at [C6] where she converts an additional 50% DEF into ATK. Her ability to sustain her team with shields, heals and AOE damage makes for a reliable DPS when your team is built around her.
Regarding Weapon Choices
When using Husk of Opulent Dreams, Serpent Spine stacks are prioritized over Husk of the Opulent Dreams stacks due to their conflicting nature in gaining stacks (Off-field and on-field).
Useful if you are unable to get ER from your substats. Does really well while its passive is active, but falls off in sustained fights. Comfort option that can lose to a high refined Whiteblind with stacks.
Only recommended with high refines, as its usefulness scales with its particle generation capabilities. R5 allows her to self-battery assuming some additional particles from enemies, but a second Geo is always recommended regardless for resonance.
Regarding Artifact Sets
Noelle snapshots her DEF on burst cast. To get the full 4 stacks' DEF% boost during your first burst, you need to wait 12 seconds off field before swapping in. In abyss, time spent before the chamber starts still generates stacks.
Optimally offers slightly less damage than Gladiator's, but is much easier to farm per resin and can have 100% uptime with crystallise shields. Consider Gladiator's Finale if you don't want to farm for as Artifact Strongbox is much more effective than elite bosses in terms of artifacts per resin.
Artifact stats priority
crit rate, crit dmg er ~20-30% def%