Hook is a Fire Element character that follows the Path of Destruction. She is a good early game DPS who specializes on inflict Burn DoTs to increase her DMG output. Despite her being a Destruction character, only her enhanced skill, that can only be activated after unleashing her ULT, can target up to 3 enemies for one turn only. However, Hook Shines more as a single target DPS.
Best Cavern Relics
(2) Increases DMG dealt to enemies with debuffs by 12%.
(4) Increases CRIT Rate by 4%. The wearer deals 8%/12% increased CRIT DMG to enemies with at least 2/3 debuffs. After the wearer inflicts a debuff on enemy targets, the aforementioned effects increase by 100%, lasting for 1 turn(s).
This set increases Hook's DMG even more against debuffed enemies. It initially enhances her Crit Rate, and also a conditional Crit DMG buff.
(2) Increases CRIT Rate by 8%.
(4) Increases DMG dealt by Skill and Ultimate by 20%. After using Ultimate, additionally increases the DMG dealt by the next Skill by 25%.
This is a great set for Hook as it boosts her Crit Rate as well as Skill and Ultimate's overall DMG.
Best Planar Ornaments
(2) Increases the wearer's CRIT Rate by 8%. When the wearer's current CRIT Rate reaches 70% or higher, the wearer's Basic ATK and Skill DMG increase by 20%.
This is Hook's generally used ornament since it enhances her Skill DMG, she only needs to reach 70% Crit Rate to trigger its buff.
(2) Increases the wearer's ATK by 12%. When the wearer's SPD is equal to or higher than 135/160, the wearer deals 12%/18% more DMG.
This set improves Hook's overall DMG, but it requires her to reach 160 SPD to activate its highest buff. The boost however is lower than Rutilent Arena, but it applies for all her attacks.
Best Stats

Body
CRIT Rate / CRIT DMG

Boots
SPD

Sphere
Fire DMG Boost

Rope
ATK%
Substats
CRIT Rate / CRIT DMG / ATK% / SPD
Best Light Cones
Moth To Flames
When the wearer attacks, increases their ATK by 8~16% in this battle. This effect can stack up to 4 time(s). After the wearer breaks an enemy's Weakness, increases DMG dealt by 12~24%, lasting for 2 turn(s).This beefs up her DMG because of the ATK it provides and however its extra DMG boost can only be obtained when Clara inflicts Weakness Break.
SourceStellar Warp, Light Cone Event Warp, Starlight Exchange, Stellar Convergence
Kinship
Increases the wearer's ATK by 24~40%. When the wearer defeats an enemy or is hit, immediately restores HP equal to 8~12% of the wearer's ATK. At the same time, the wearer's DMG is increased by 24~40% until the end of their next turn. This effect cannot stack and can only trigger 1 time per turn.This provides Hook with needed DMG boost and heals her whenever she defeats an enemy or was hit.
SourceInternal Purchase Officer, Echo of War, Memo-Keeping Light Casket, Light Cone Manifest
Run!
Increases the wearer's ATK by 10~20%, and increases their DMG to enemies afflicted with Burn or Bleed by 16~32%. This also applies to DoT.Since Hook inflicts Burn DoT, she can easily gain its effect not just by inflicting Weakness Break.
SourceStellar Warp, Departure Warp, Character Event Warp, Light Cone Event Warp
Fantastic Adventure
When the wearer uses Basic ATK, Skill, or Ultimate to attack enemies, the wearer gains one stack of Mischievous. Each stack increases the wearer's ATK by 12~24%.Its effect will last until the end of battle, however, Hook must have at least 2 turns to maximize the ATK it provides.