Invisible Stalker and Boneless (Patreon)

In 5e, the invisible stalker lost one of my favorite traits it had; it's an extremely effective as a summoned assassin, and absolutely HATES being summoned. I tried to lean into both of these elements, giving it a couple ways to covertly murder people, and a penalty for those who set it a task it can't complete in a reasonable time period.

The Boneless is another solid assassin creature; a leathery blob made by animating the leftovers once a skeleton has hatched.