The swing damage of the Menavilons is much to high. it is very much overpowerd and not realistic.. it is just a Spear and not a Lightsaber!
Spears are actually one of the best close combat weapons. Addind a long blade to it makes them something like a super weapon. The demage makes sense, because you get much more momentum with a long pole than with just holding the blade itself. Menavlions are very powerful in the game, but rather easy to counter with sword and shield, Bow and arrows or throwing weapons like javelins.