I've been throwing this idea around everywhere. I was thinking that there could be an Exotic for Nightstalkers that grants the user Blood-bound for free. Although I don't have a name or a look for it yet so feel free to state some names down below and other perks for Warlocks and Titans!
Speaking of Titans there is another forum post that had a pretty good idea for Titans so here you go Titans:
[url]https://www.bungie.net/en/Forum/Post/185899397/0/0[/url]
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Yeah that's OP for PvP. Maybe something that grants lockdown (to go along with the whole zone-control aspect of night stalker) or the perk that makes smoke act as a trap