Weapon Tier

Weapon Tier is increased each time you get 10/10 Sharpness on your weapon and then upgrade it! From the start you will be able to reach Weapon Tier 25. Once you done this you need to Ascend wich will increase your highest Weapon Tier you can reach by 5 each time. Once you reach your highest Weapon Tier and Ascended a couple of times you will be able to reach Weapon Tier 75, this will unlock Transcend for you.

Note: Its only Melee Weapon Tier that counts for Ascend and Transcend. But the Ranged Weapon Tier is still locked at the same lvl you are able to go with Melee Weapon Tier!