My go-to for any rescue mission or any mission where you want to give your team a little bit of stealth support (read: spy missions). 20+ seconds of invisibility to cloak yourself, your pet, your allies, your allies' pets, rescue hostages, whatever. Very helpful for reviving allies as it cloaks both of you to revive them in peace, and even leaves them with plenty of free invisibility after they're back up, and now gives them the equivalent of a free [Point Strike] on all of their weapons.

Pair with your favorite melee weapon, preferably one with lots of range to take full advantage of that stealth melee multiplier.