My sword I picked was void edge because less enemy's deal void attack and I have less void based weapons. Are their more powerful swords to find in game?:) I think they are great. Especially when your hiding behind a rock and a column of vex march past you, I can jump out and chop them all up! Plus being a warlock I'm like a complete Sith Lord with lighting and sword play:)
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Once you fully level it up and infuse it to 280, a quest to turn it exotic opens up.