Coolest weapons in games

[Leynos]

 

Strider Hiryu Cypher. A plasma sword that can freeze enemies. Burn them. Anti-gravity and more. All wielded so fast it leaves a blur.

Warhammer 40K Chainsword. 

Gears Lancer. An assault rifle with a chainsaw. Need I say more?

The Monando. A laser sword has many abilities, but it can also tell the future. So, any enemy attack gives you a warning to dodge and counter.