This weapon in its dormant state look similar to a Yklwa. It has a 2,5 feet long Grip on which end there is a crude but well made Hand guard, beyond that you can see the remnants of a former great blade. Whats left is a 2 feet pointy piece of metal, on top and bottom of which the surface is well polished. To a point where it is easy to see that this former blade was crafted by a master weapon smith. Fine lines of folded metal can be seen, each with a slightly different hue. 
The sides of the broken blade are rough, great force was used to break this blade. 

When this weapon is being held in one hand, it has the properties of an Yklwa, are both hands placed on the sword handle though, bright light radiates from the broken blade and the former blade seams to be reconstructed out of pure light. 

One Handed:  Type: Yklwa: simple, thrown(10/30), Damage: 1d8 + str

Two Handed:  Type: greatsword: martial, heavy,  two-handed, Damage: 2d6 + str, 
Casting bright light in a 10ft radius and dim light in a 30ft radius. 

This weapon gives +1/+1 against evil, +0/+0 against neutral and -1/-1 against good aligned creatures. No matter how many hands are used.

A yklwa (pronounced YICK-ul-wah) is a simple melee weapon that is the traditional weapon of Chultan warriors. A yklwa consists of a 3-foot wooden shaft with a steel or stone blade up to 18 inches long. It costs 1 gp, and it deals 1d8 piercing damage on a hit. Although it has the thrown weapon property, the yklwa is not well balanced for throwing (range 10/30 ft.).

Notes: Versatile (2d6 + {{abilityscore:str}}), +1 vs evil, -1 vs good, Spend a short rest getting to know the weapon, Thrown