The Determination Knife is obtainable after Flowey's death in Soultale.
D.Knife is a rare weapon made from a monster with the soul of Determination. The knife is dropped after a monster with the Determination SOUL is killed.

This weapon replaces the Toy Knife in the 2nd route of Soultale. This knife can be sold for 250. If Gaster is found in Soultale, the knife can be obtainable after he disappears.

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