To get Dragon Talon in Blox Fruits, start by unlocking Dragon Breath. Go to the Second Sea Main Docks and buy Dragon Breath from an NPC on a bridge for 1500 fragments.
Next, level up Dragon Breath Mastery. To do this, reach Mastery Level 400 by defeating high-level NPCs. This will give you the maximum XP points needed.
Then, prepare the required currency and items. You’ll need 3 Million Beli and 5000 fragments. Obtain Fire Essence by purchasing random surprises from the Death King NPC at the Haunted Castle. Each surprise costs 50 bones and can be bought up to 10 times every 2 hours. Keep buying until you get the Fire Essence.
Finally, purchase Dragon Talon. Go to Uzoth and buy the Dragon Talon for 3 Million Beli, 5000 fragments, and the Fire Essence.