Dagger
Daggers are extremely close-ranged melee weapons that inflict a huge amount of damage in exchange for very high risk of getting hit due to reduced reach.
Daggers have 5 more damage than their sword equivalents, and an attack speed of 2, making them also faster than swords. This may seem absurdly overpowered, however they have -0.75 attack reach, giving hardly any room to land hits safely.
Daggers can be crafted with the shown recipe, with the material of choice in the place of iron.
Iron daggers can be found in Cellar vaults, and diamond daggers can be found in Cellar and Trial Chamber vaults.
Daggers can be repaired at an anvil using their base material, like any vanilla tool.
As with all Valiance items, when upgraded with Netherite, daggers may seem to not be changed in the smithing table output, but will once entering the inventory. (This issue cannot currently be fixed but will be in the future.)
Due to the great danger of facing armed mobs with a dagger, a build focused on the Protection enchantment is best for using daggers. At least 2 pieces of armor should be enchanted with Protection, to ensure melee attacks specifically are accounted for.
Speed is also beneficial to dagger-based builds, to make backing out after an attack more consistent. A Totem of Irregularity focused on speed would likely be the optimal offhand item.