Tower Weapons
A customisable weapon made from materials found by playing through the 
Sky Corridor .
You can customize weapon attributes such as Sharpness, Raw, Elemental, Status, Shelling Type, Shot Type, etc. They are comparable to Lv50 G Rank weapons when fully upgraded. You can insert Tower Decorations, which gives skills without using slots, making it a powerful weapon when built correctly. You cannot reverse most of the attribute upgrades.
Light versions of weapons have two sigils slots and a single decoration slot, while Dark versions gives you a single sigil slot and two decoration slots.
Tower Sigils are used to grant Affinity, Status, Elemental, Zenith Skills or Weapon Abilities. You can only have as many of these properties as you have Sigil slots and you can't have two of the same type (for example, two Elemental, Status or Affinity sigils does not stack.)
Tower Decorations grant your weapon a skill. For
example, if you have a Tower Decoration for
In order to remove a Tower Decoration, you need to buy
a
The rest of the Tower Weapon materials are available at
the 
Road Shop . Alternatively, you can replace them directly at the cost of losing
the previously slotted decoration. A
Tower Weapons can be crafted by talking to the Cat
wearing a backpack in the 
Blacksmith .
The Blue series of the tower weapons have 3 Tower Sigil slots. They have high enough stats to surpass all weapons (except Evolution, certain Premium weapons and Road). They require Zenith materials to craft, but they do not have the Zenith Partbreaker effect. Zenith Sigils affect any skills granted (including Exotics, Hybrids and from Tower Decorations).
In addition to the tower gems like
If you are looking for a Tower Weapon Simulator, you
can find it in the Tools and Utilities section.