I'm personally a bigger fan of [b]Fallen Sunstar[/b]. [i]Ionic Trace[/i] builds lend to better ability uptime on Warlock than damn near anything else. [b]Crown[/b] demands ability/jolt kills, not always feasible in endgame. [i] Spark of Ions, Spark of Beacons & Spark of Discharge[/i] are all necessary implements to maximize [b]Sunstar[/b], but as long as you're willing to commit to them, you'll pretty much have infinite abilities. Throw in a [b]Voltshot Special[/b] (Indebted/Undercurrent/Ded Grandma) & you'll be all set. Another factor for myself is my preference for [b]Chaos Reach[/b] as a [i]Super[/i]. There's already so many potent ways to ad clear in the game, I prefer to not use my Super for it. That said, [b]Crown[/b] has great Fireteam Support, especially when run with the [i]Power Preservation Mod[/i]. You can enable allies to chain [i]Supers[/i] after you destroy with [b]Stormtrance[/b]. . That said, my personal favorite [i]Arc-Lock[/i] is [b]Vesper Radius[/b]. You can build a[i] Chaos Reach[/i] in around 30-40s provided solid ad density. It's hyper aggressive and enables crazy CC for ad dense scenarios. The [i]Super[/i] uptime is nice burst DPS to boot. . Another fun one is [b]Verity's Brow[/b]. Though strongest on [i]Solar[/i], there's so many absurd [i]Arc[/i] Weapons in the game to make this Exotic shine on [i]Arc[/i] as well. [i]Forebearance[/i] is great with it, but once again if you build into [i]Ionic Traces[/i], you really can't beat [i]Indebted[/i] or [i]Undercurrent[/i] (assuming [b]Voltshot[/b]). I personally run [b]Storm Grenade[/b] when on this, but[b] Pulses[/b] & even [b]Flux[/b] are pretty awesome when on [i]Verity's[/i].