Few easy steps to create a custom weapon in-game
1.You need a base. You can purchase one in-game for Elaris-Points or Gold Coins

2.You need tokens. You can purchase them in-game or directly on the website.

3.Use the Teleporter/Teleporting Orb and select "Upgrade Zone"
4.Equip the weapon you want to upgrade and click on "Hephaestus"

5.Select the Status you want to Upgrade/Add.

6.That's it. The bonus will be applied immediately.
For the current content, the stats are capped at:
Main stats 150k(15 tokens)
Attack power 300k (15 tokens)
Spell Power 450k(15 tokens)
Haste 3k (10 tokens)
Weapon Damage 100-130k(10 tokens)
Hit/Crit/Exp 1.2k (4 tokens)
Meta Socket 3 slots (3 tokens)
Regular gems 3 slots (3 tokens)