Merge to Improve Rarity

Select two swords of the same rarity to merge and cost (40$) SWD + 0.04 BNB can improve rarity.

Level	Rarity
Level 1	Common
Level 2	Rare
Level 3	Epic
Level 4	Legend
Level 5	Unique
Level 6	Myth

Merge 2 Common swords can get 1 Rare Sword.

Merge 2 Rare swords can get 1 Epic Sword.

The highest rarity that can be improved is Epic.