Mantis Petra

Behaviour and Tactics
They hover just outside of the Knight's melee reach. They fling scythes at the player that will swoop down in a parabolic arc, slow at the apex, then come back up.

If possible, try to get slightly above them to lure them close and hit them with a Nail Art or Spell before they hover away again. Alternatively, using Howling Wraiths/Abyss Shriek or Grubberfly's Elegy will close the distance.

They often show up in groups with another Petra or a Mantis Traitor. Get rid of them first, as their aerial attacks make fighting ground-based enemies aggravating.

Dreamshield will destroy their scythes when making contact, making this charm useful against them.

Location
The Mantis Petra are very commonly found in Queen's Gardens, usually as a challenge in the platforming sections. Also found within the Colosseum of Fools, in the 9th, 14th and 17th wave of the Trial of the Fool.