Beacon from the Reed Sea
5-star Claymore
This is Dehya’s signature weapon, although a lot of might the color scheme doesn't match hers. The Beacon buffs Dehya’s ATK by 20% for 8s after her Elemental Skill hits a rival. After taking damage, her ATK will even increase by 20% for 8s. What’s better is both of these effects could be triggered even when Dehya isn’t around the field. Furthermore, Dehya’s Max HP is going to be increased by 32% if your shield doesn't protect her.
Wolf’s Gravestone
5-star Claymore
Although this really is marketed as Diluc’s weapon, WGS is usually good for any Claymore users. Not only will Dehya obtain a 20% increase in ATK, but attacks against foes with under 30% Health will even enhance all party members’ ATK by 40% for 12s on hit.
Serpent Spine
4-star Claymore
Although you will get this weapon only with the Battle Pass, it's a good choice because it provides an additional CRIT Rate. Thanks to its passive, Dehya can experience an increase in DMG from all sources. However, for damage, you’ll lose a collection of its effects.
F2P Substitutes:
Favonius Greatsword
4-star Claymore
This claymore can sort out Dehya’s issues in producing energy particles. CRIT Hits possess a 60% possibility of generating Elemental Particles, which replenish 6 Energy for that character. This can only happen once every 12s.
Katsuragikiri Nagamasa
4-star Claymore
Elemental Skill DMG is increased by 6%. When Elemental Skill hits a rival, the smoothness loses 3 Energy but regenerates 3 Energy every 2 seconds for the next 6 seconds. This phenomenon can happen once every 10s. Even if the smoothness is not around the field, it could be activated.
Luxurious Sea-Lord
4-star Claymore
This is really a 2.1 event-exclusive 4-star Claymore which will give Dehya a 12% increase in Elemental Burst DMG. When Elemental Burst strikes a rival, there is really a 100% possibility of summoning an enormous onrush of tuna that deals 100% ATK as AoE DMG once every 15 seconds. Comical, but instead useful!