Drax Pre-Hardmode
Solution 1:
If you were playing the PC version, you'd be correct, this is highly unusual. However, on mobile, this is intended and expected, as explained on the official wiki.
- [Mobile][3DS] The Drax can be found in one Shadow Chests in a world. Because of this, the player has a significant mining advantage, as it can mine all pre-Plantera blocks, at which point the Picksaw is needed. It makes killing Mechanical Bosses much easier, as the player will have access to Chlorophyte weapons and armor.