Durin is a Pyro Sub DPS with 100% up of off-field Pyro DMG and application whose main source of damage is his Elemental Burst. He has two modes of supporting his team.
In his "light mode" (Skill > Skill > Burst), he provides RES Shred for Pyro, and one among Electro, Anemo, Dendro or Geo depending on the relevant Elemental Reaction triggered, focusing on supporting his team to deal more damage. And his Burst deals AOE damage.
In his "dark mode" (Skill > NA > Burst), his Vaporize and Melt DMG is increased, focusing more on his personal damage. And his Burst is single target.
If paired with other Hexerei characters, his RES Shred and Vaporize/Melt DMG mentioned above increases even further.
Best Artifacts
(2) Elemental Burst DMG +20%
(4) Using an Elemental Burst increases all party members' ATK by 20% for 12s. This effect cannot stack.
Best set for Durin for buffing the team, if no one else has it.
(2) Energy Recharge +20%
(4) Increases Elemental Burst DMG by 25% of Energy Recharge. A maximum of 75% bonus DMG can be obtained in this way.
Best set for boosting Durin's personal damage.
Best Stats

Sands
ATK%

Goblet
Pyro DMG Bonus

Circlet
CRIT Rate / CRIT DMG
Substats
CRIT Rate / CRIT DMG / ATK% / Energy Recharge / Elemental Mastery
info
Durin needs 2500 ATK to cap the 75% Burst DMG Bonus from his talent.
Best Weapons
Base ATK608
CRIT Rate+33.1%
SourceEvent Wish
Day King's Splendor Solis
CRIT DMG from Elemental Bursts is increased by 16~32%. When an Elemental Burst hits an opponent, gain the Blade of the Daylight Hours effect: ATK is increased by 20~40%. Nearby active party members other than the equipping character have their ATK increased by 16~32% for 3s.
Additionally, when the party possesses Hexerei: Secret Rite effects, the effects of Blade of the Daylight Hours are increased by an additional 75%. This effect can be triggered even if the equipping character is off-field.Durin's signature weapon. Provides massive ATK buffs for teammates too.
Base ATK608
Elemental Mastery+198
SourceEvent Wish
Revolutionary Chorale
A part of the "Millennial Movement" that wanders amidst the winds.
Increases DMG by 10~20%.
When the character wielding this weapon triggers Elemental Reactions, they gain a Sigil of Rebellion. This effect can be triggered once every 0.5s and can be triggered even if said character is not on the field.
When you possess 2 Sigils of Rebellion, all of them will be consumed and all nearby party members will obtain "Millennial Movement: Song of Resistance" for 12s.
"Millennial Movement: Song of Resistance" increases Normal, Charged, and Plunging Attack DMG by 16~32% and increases ATK by 20~40%. Once this effect is triggered, you will not gain Sigils of Rebellion for 20s.
Of the many effects of the "Millennial Movement," buffs of the same type will not stack.For team buffs.
Base ATK674
CRIT DMG+44.1%
SourceEvent Wish
Mistsplitter's Edge
Gain a 12~24% Elemental DMG Bonus for all elements and receive the might of the Mistsplitter's Emblem. At stack levels 1/2/3, Mistsplitter's Emblem provides a 8/16/28~16/32/56% Elemental DMG Bonus for the character's Elemental Type. The character will obtain 1 stack of Mistsplitter's Emblem in each of the following scenarios: Normal Attack deals Elemental DMG (stack lasts 5s), casting Elemental Burst (stack lasts 10s); Energy is less than 100% (stack disappears when Energy is full). Each stack's duration is calculated independently.Durin might not be able to fully stack the effects, but the DMG bonuses from the partial stacks are still nice. And the CRIT DMG main stat is welcome.
Base ATK674
CRIT DMG+44.1%
SourceEvent Wish
Deathly Pact
CRIT DMG increased by 20~40%. Increasing the value of a Bond of Life increases the DMG the equipping character deals by 16~32% for 6s. Max 3 stacks.Stat stick for Durin.
Base ATK542
CRIT Rate+44.1%
SourceEvent Wish
Protector's Virtue
HP increased by 20~40%. Additionally, provides an ATK Bonus based on 1.2~2.4% of the wielder's Max HP.Nice CRIT Rate and ATK bonus.
Base ATK510
CRIT Rate+27.6%
SourceBattle Pass
Northwind Wolf
DMG dealt by Elemental Skill and Elemental Burst is increased by 16~32%. When an Elemental Skill hits an opponent, its CRIT Rate will be increased by 2~4%. When an Elemental Burst hits an opponent, its CRIT Rate will be increased by 2~4%. Both of these effects last 10s separately, have 4 max stacks, and can be triggered once every 0.1s.Good BP weapon. Buffs Durin's Elemental Burst which is his main source of damage.
Base ATK565
ATK+27.6%
SourceQuest, Event Wish
Secret Silver's Testament
Increases Elemental Burst DMG by 20~40%. When the equipping character's Energy Capacity does not exceed 60/40, their Elemental Burst DMG is increased by an additional 16%/28%~32%/56%.Another weapon that buffs Durin's Burst, although he doesn't meet the requirements for the second part of the passive so he can't fully utilize the buffs.
Base ATK510
ATK+41.3%
SourceWish
Bane of Fire and Thunder
Increases DMG against enemies affected by Pyro or Electro by 20~36%.Great for Overload teams.
Base ATK454
ATK+55.1%
SourceForging
Iwakura Succession
After casting an Elemental Skill, gain 1 Succession Seed. This effect can be triggered once every 5s. The Succession Seed lasts for 30s. Up to 3 Succession Seeds may exist simultaneously. After using an Elemental Burst, all Succession Seeds are consumed and after 2s, the character regenerates 6~12 Energy for each seed consumed.Viable craftable weapon for Burst uptime.
Base ATK401
CRIT DMG+46.9%
SourceWish, Quest, NPC
Vigorous
When HP is above 90%, increases CRIT Rate by 14~28%.Since Durin is mostly off-field, he can maintain a high enough HP to keep the effects of this weapon, granting him both CRIT DMG from the stat and CRIT Rate from the passive.