What's your favorite
I mean the one you get from the gunsmith
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There's gobs of exotics for each. And you can pick out a good one for each. Titan? Ruin Wings will send extra heavy your way, and armamentarium will make you dominant in PvP, especially if you like stickies. And blinding bubbles are fun, too. Hunter? Khepri or Don't Touch will make you invisible, Eao will make you fly. And even them nasty little warschlocks can have fun with Obsidian Mind and Nova Bombs for days. Or Tlaloc and Crucible domination.