Hydro Traveler Boy

Hydro
Sword
5★
Ascension stat: ATK%

A traveler from another world who had their only kin taken away, forcing them to embark on a journey to find The Seven.

What it costs to finish this character

1,350

resin, level 1 → 90 and all three talents to 10

2,072,500

mora

days at a minimum, if you spend nothing else

Ascension alone: 760 resin (boss drops only) · talents alone: 590 resin.

Talent domain: Equity, open Monday, Thursday, Sunday.

A Crown of Insight is needed for the tenth level of each talent, and crowns are not farmable at any resin price — they come from events.

Materials and mora above are exact, straight from the game’s own tables. The resin figure and the day count divide by an average drop per run, which the game does not publish — they are a community-measured mean, not a promise.

Materials

Ascension, level 1 to 90
Material	Total
Brilliant Diamond Gemstone	6
Brilliant Diamond Chunk	9
Ominous Mask	36
Brilliant Diamond Fragment	9
Stained Mask	30
Brilliant Diamond Sliver	1
Windwheel Aster	168
Damaged Mask	18
Mora	420,000

One talent, level 1 to 10
Material	Total
Worldspan Fern	6
Crown of Insight	1
Philosophies of Order	20
Philosophies of Justice	12
Philosophies of Equity	6
Xenochromatic Crystal	31
Guide to Justice	11
Guide to Equity	6
Guide to Order	4
Transoceanic Chunk	22
Teachings of Equity	3
Transoceanic Pearl	6
Mora	1,652,500

The talent table is for one ability. Levelling all three costs three times as much.

Talents

Foreign Stream

Normal Attack

Performs up to 5 rapid strikes.

Charged Attack

Consumes a certain amount of Stamina to unleash 2 rapid sword strikes.

Plunging Attack

Plunges from mid-air to strike the ground below, damaging opponents along the path and dealing AoE DMG upon impact.

Foreign Stream scaling, level 1 to 10
Level	1	2	3	4	5	6	7	8	9	10
1-Hit DMG	44.5%	48.1%	51.7%	56.9%	60.5%	64.6%	70.3%	76.0%	81.7%	87.9%
2-Hit DMG	43.4%	47.0%	50.5%	55.5%	59.1%	63.1%	68.7%	74.2%	79.8%	85.9%
3-Hit DMG	52.98%	57.29%	61.60%	67.76%	72.07%	77.00%	83.78%	90.55%	97.33%	104.72%
4-Hit DMG	58.31%	63.05%	67.80%	74.58%	79.33%	84.75%	92.21%	99.67%	107.12%	115.26%
5-Hit DMG	70.78%	76.54%	82.30%	90.53%	96.29%	102.88%	111.93%	120.98%	130.03%	139.91%
Charged Attack DMG	55.90%+60.72%	60.45%+65.66%	65.00%+70.60%	71.50%+77.66%	76.05%+82.60%	81.25%+88.25%	88.40%+96.02%	95.55%+103.78%	102.70%+111.55%	110.50%+120.02%
Charged Attack Stamina Cost	20.0	20.0	20.0	20.0	20.0	20.0	20.0	20.0	20.0	20.0
Plunge DMG	63.9%	69.1%	74.3%	81.8%	87.0%	92.9%	101.1%	109.3%	117.5%	126.4%
Low/High Plunge DMG	127.84%/159.68%	138.24%/172.67%	148.65%/185.67%	163.51%/204.24%	173.92%/217.23%	185.81%/232.09%	202.16%/252.51%	218.51%/272.93%	234.86%/293.36%	252.70%/315.64%

Aquacrest Saber

Unleashes a torrent that can cleanse the world.

Press

Sends a Torrent Surge forward that will deal Hydro DMG to opponents it comes into contact with.

Hold

Enter Aiming Mode and constantly fire off Dewdrops in the direction in which you are aiming, dealing Hydro DMG to opponents they hit.

When the skill ends, it will send a Torrent Surge forward that will deal Hydro DMG to opponents it comes into contact with.

Suffusion: When using the Hold configuration of this skill, if the Traveler's HP is higher than 50%, the DMG dealt by Dewdrops will increase based on the Traveler's Max HP, and the Traveler will lose a fixed amount of HP every second.

Arkhe: Pneuma

At certain intervals, after using Torrent Surge, this skill will unleash a Spiritbreath Thorn that pierces opponents, dealing Pneuma-aligned Hydro DMG.

You studied the ripples in the water with Paimon.

Aquacrest Saber scaling, level 1 to 10
Level	1	2	3	4	5	6	7	8	9	10
Torrent Surge DMG	189.3%	203.5%	217.7%	236.6%	250.8%	265.0%	283.9%	302.8%	321.8%	340.7%
Dewdrop DMG	32.8%	35.3%	37.7%	41.0%	43.5%	45.9%	49.2%	52.5%	55.8%	59.0%
Spiritbreath Thorn DMG	32.8%	35.3%	37.7%	41.0%	43.5%	45.9%	49.2%	52.5%	55.8%	59.0%
Spiritbreath Thorn Interval	9.0s	9.0s	9.0s	9.0s	9.0s	9.0s	9.0s	9.0s	9.0s	9.0s
Suffusion HP Cost	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP	4.00% Max HP
Suffusion DMG Bonus	0.64% Max HP	0.69% Max HP	0.74% Max HP	0.80% Max HP	0.85% Max HP	0.90% Max HP	0.96% Max HP	1.02% Max HP	1.09% Max HP	1.15% Max HP
Hold Duration	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s	Max 6.0s
CD	10.0s	10.0s	10.0s	10.0s	10.0s	10.0s	10.0s	10.0s	10.0s	10.0s

Rising Waters

Unleashes a slow-moving floating bubble that deals continuous Hydro DMG to nearby opponents.

You studied the ebb and flow of the tides with Paimon.

Rising Waters scaling, level 1 to 10
Level	1	2	3	4	5	6	7	8	9	10
Skill DMG	101.9%	109.5%	117.1%	127.3%	135.0%	142.6%	152.8%	163.0%	173.2%	183.4%
Duration	4.0s	4.0s	4.0s	4.0s	4.0s	4.0s	4.0s	4.0s	4.0s	4.0s
CD	20.0s	20.0s	20.0s	20.0s	20.0s	20.0s	20.0s	20.0s	20.0s	20.0s
Energy Cost	80	80	80	80	80	80	80	80	80	80

Constellations

C1 · Swelling Lake
Picking up a Sourcewater Droplet will restore 2 Energy to the Traveler.
You must first unlock the Ascension Talent "Spotless Waters."
C2 · Trickling Purity
The Movement SPD of Rising Waters' bubble will be decreased by 30%, and its duration increased by 3s.
C3 · Turbulent Ripples
Increases the Level of Aquacrest Saber by 3.
Maximum upgrade level is 15.
C4 · Pouring Descent
When using Aquacrest Saber, an Aquacrest Aegis that can absorb 10% of the Traveler's Max HP in DMG will be created and will absorb Hydro DMG with 250% effectiveness. It will persist until the Traveler finishes using the skill.
Once every 2s, after a Dewdrop hits an opponent, if the Traveler is being protected by Aquacrest Aegis, the DMG Absorption of the Aegis will be restored to 10% of the Traveler's Max HP. If the Traveler is not presently being protected by an Aegis, one will be redeployed.
C5 · Churning Whirlpool
Increases the Level of Rising Waters by 3.
Maximum upgrade level is 15.
C6 · Tides of Justice
When the Traveler picks up a Sourcewater Droplet, they will restore HP to a nearby party member with the lowest remaining HP percentage based on 6% of said member's Max HP.

Weapons and artifacts

UNSURE This is not a tier list and not community guidance — this product has neither. It is a mechanical shortlist, and the rule is printed so you can check it: Swords of 4★ and above whose secondary stat is one this character’s ascension stat scales with, ordered by base attack at level 90. Weapon passives are not weighed, because a passive is an effect and not a number.

Weapons of the right type and stat
Weapon	Rarity	Base ATK at 90	Secondary stat
Mistsplitter Reforged	5★	674	CRIT DMG
Absolution	5★	674	CRIT DMG
Azurelight	5★	674	CRIT Rate
Whitelake Frostfeather	5★	674	CRIT Rate
Summit Shaper	5★	608	ATK%
Haran Geppaku Futsu	5★	608	CRIT Rate
Athame Artis	5★	608	CRIT Rate
Exaiphanes Blade	5★	608	CRIT Rate

Sets whose two-piece bonus raises this character’s Hydro damage or the stat they ascend into
Set	Two-piece	Four-piece
Resolution of Sojourner	ATK +18%.	Increases Charged Attack CRIT Rate by 30%.
Brave Heart	ATK +18%.	Increases DMG by 30% against opponents with more than 50% HP.
Gladiator's Finale	ATK +18%.	If the wielder of this artifact set uses a Sword, Claymore or Polearm, increases their Normal Attack DMG by 35%.
Heart of Depth	Hydro DMG Bonus +15%	After using Elemental Skill, increases Normal Attack and Charged Attack DMG by 30% for 15s.
Shimenawa's Reminiscence	ATK +18%.	When casting an Elemental Skill, if the character has 15 or more Energy, they lose 15 Energy and Normal/Charged/Plunging Attack DMG is increased by 50% for 10s. This effect will not trigger again during that duration.
Vermillion Hereafter	ATK +18%.	After using an Elemental Burst, this character will gain the Nascent Light effect, increasing their ATK by 8% for 16s. When the character's HP decreases, their ATK will further increase by 10%. This further increase can occur this way a maximum of 4 times. This effect can be triggered once every 0.8s. Nascent Light will be dispelled when the character leaves the field. If an Elemental Burst is used again during the duration of Nascent Light, the original Nascent Light will be dispelled.
Echoes of an Offering	ATK +18%.	When Normal Attacks hit opponents, there is a 36% chance that it will trigger Valley Rite, which will increase Normal Attack DMG by 70% of ATK. This effect will be dispelled 0.05s after a Normal Attack deals DMG. If a Normal Attack fails to trigger Valley Rite, the odds of it triggering the next time will increase by 20%. This trigger can occur once every 0.2s.
Nymph's Dream	Hydro DMG Bonus +15%	After Normal, Charged, and Plunging Attacks, Elemental Skills, and Elemental Bursts hit opponents, 1 stack of Mirrored Nymph will be triggered, lasting 8s. When under the effect of 1, 2, or 3 or more Mirrored Nymph stacks, ATK will be increased by 7%/16%/25%, and Hydro DMG Bonus will be increased by 4%/9%/15%. Mirrored Nymph stacks created by Normal, Charged, and Plunging Attacks, Elemental Skills, and Elemental Bursts exist independently.

To turn this into a real recommendation section, add a build dataset — per character, the weapons and sets a community source actually recommends, with the rotation each assumes. Nothing in the game’s published data contains that judgement, and a ranking invented here would be indistinguishable from a researched one, which is why there is not one.

Teams

To build a team section, add team data. Which characters go together is judgement about rotations, energy and shielding that this product does not receive and will not guess at.

What is published is the reaction chart. Hydro takes part in:

Vaporize with Pyro
Frozen with Cryo
Electro-Charged with Electro
Bloom with Dendro