Crystal sword form Diablo 2. It's a bit of an interpretation, cause you can't make out any detail from the sprites. Only the devs know what it's technically supposed to look like.
What it looked like in game:
![](http://classic.battle.net/images/battle/diablo2exp/images/items/weapons/crystalsword.gif)
Modeled in Maya, textured in Substance Painter
Time: ~1.5 days