They are not interchangeable—Seathorn suits Oscelda-line Spirit+Grace casters while Stultin suits Tethren Courage melee, so your pact line decides the w...
Weapon overview
Seathorn
Magick · Spirit · Rare
Rare Oscelda coastal staff requiring Spirit 18 and Grace attunement. Fragments drop from Crypt Sarcophagi in the Circade crypt, as well as Enclave Votives at Tier 3 (Alca's Children and Kith of Kings). Craft at Tuvalkane using Knotwood×20 and Moranite×6. The staff's defining trait is its high charged Magick burst — at 198 charged damage it outperforms similarly leveled Spirit staves for single-target burst rotations. Post-Preludes 15: 44 ATK, 198 charged. The coastal thematics tie to Oscelda lore, where sea-adjacent magick traditions produce staves tuned for sustained Spirit-based spell weaving rather than rapid-fire spam.
Stultin is an Uncommon cleaver-style Long Blade requiring 16 Courage, themed around the ancient Mockery lore. With 53 base ATK, 34 stagger, and 3% smite, it serves as a mid-game bridge before Marrow's Bane (21 Courage, 54 ATK). Farm fragments from Armoured Mockery or Thrice-bound Impidh (normal and Cogah variants). Dendrit Chests in the Glades and Deadwood Mockery encounters provide supplemental drop tables. Craft at Tuvalkane with Scrap Brass, Ichor, and Corrupt Onyx (10h). Purchase from Avakot for 235 Dracs. Stultin fills the Courage cleaver progression gap between Falx (12 Courage, 54 ATK) and Marrow's Bane (21 Courage, 54 ATK) — offering 16 Courage gate with 53 ATK, only 1 ATK less than both alternatives. The lore describes Stultin as a cut and rusted sword from an unremembered battle, filed flat in falchion style with a petrified wooden hilt. The glowing runes etched into settled rust suggest the blade's power persists beyond its physical decay. Effective in Crypt of the Circade content and against Mockery-type enemies where the ancient blade's resonance deals bonus damage. Pairs with Tethren melee builds for high-stagger cleaver combos.