IMPORTANT NOTICE: At the time of writing, Hydro Traveler provides no utility to a team that cannot be better filled by another unit, including Barbara, who all players can obtain at AR 18.
This playstyle focuses on using their Skill and Burst to trigger support-based weapon and artifact passives while dealing Pneuma damage with their Skill. This is only recommended if a source of Pneuma is required and Traveler is your only source of Pneuma-aligned damage.
The guaranteeable 4-star can also provide an Arkhe attack for other characters, further diminishing Hydro Traveler's usability if this weapon has been obtained.
Do not use Hydro Traveler unless you need them for Pneuma mechanics and do not own yet.
Traveler does not generate particles if interrupted during the hold state of their Skill.
Regarding Weapon Choices:
Key of Khaj-Nisut: Hydro Traveler must use their Hold Skill to activate this weapon's passive. Use HP% main stats to help boost the effect of this weapon's passive, further boosting its team buffing potential.
Xiphos' Moonlight: Use Elemental Mastery main stats to help boost the effect of this weapon's passive, further boosting its team buffing potential.
Regarding Artifact Choices:
Sets
Tenacity of the Millelith (4): Only used if you use the hold version of Traveler's Skill.
Silken Moon's Serenade (4): A great option for Hydro Traveler in teams that have two or more Nod Krai characters.