Trade the Bec de Faucon, the fragment, the Necropsyche, and the currency to the blank space at (F-7) in North Gustaberg (accessible only by traveling through Dangruf Wadi) to receive a cutscene, your Apocalypse, and 30 Lungo-Nango Jadeshells. The Tenebrous Fragment drops from the Animated Scythe in Dynamis - Xarcabard. The Bec de Faucon will allow you to use the special weapon skill Catastrophe, but only in Dynamis areas. Trade these two items and the fee to Switchstix and he will upgrade your Dynamis Scythe to the Bec de Faucon.

The Attestation of Vigor drops from the notorious monster Velosareon in Dynamis - Beaucedine. Trade all four items and the fee to Switchstix and he will upgrade your Memento Scythe to a Dynamis Scythe. Trade all four items and payment in Jadeshells to Switchstix and he will upgrade it to a Memento Scythe. The Manticore Leather and Rainbow Obi can be crafted or bought at the Auction House. The Mammoth Tusk is crafted (Bonecraft 94) from a Giant Frozen Head which is dropped in Dynamis - San d'Oria and Dynamis - Beaucedine. The Relic Scythe is a drop from Dynamis - Bastok.

Switchstix in Castle Zvahl Baileys can upgrade degraded weapons if you bring him the things he wants.

Bonecraft walkthrough