Sacrificial Sword: Prioritized over due to Dendro Traveler's exceedingly high Energy Recharge requirements for Burst uptime consistency.
Regarding Artifact Choices:
Prioritize maintaining their Burst uptime, the Energy Recharge needs for Dendro Traveler would be a lot greater if they are the only Dendro unit in the team.
Sets
Noblesse Oblige (4): This option would generally be better than (4) if Dendro Traveler is used in an Aggravate focused team.
The Exile (4): An alternative option if they are placed in the same team as Cyno to help his Energy Recharge needs.