Prince of Persia The Lost Crown

An easy, fast, and early location to grind this out can be found near a Wak Wak Tree in the Hyrcanian Forest. Jump down to the right to find a bird enemy that spawns just below some spikes. Quickly jump and use an up attack to knock it into the spikes. Return to the Wak Wak Tree and interact with it to cause the enemy to respawn. Rinse and repeat!

Early-mid game, this is very easy; but, if like me, you didn't try for this until you got too overpowered - here is an option:

1.) Turn enemy health, under difficulty options, up to maximum
2.) Go to the "Sacred Archives" fast travel point
3.) Descend to the zone directly below the one with the fast travel point (take note of the spikes you cross on the way)
4.) Use the Dimensional Claw to grab one of the acolyte/priest guys that throw firebombs
5.) Return to the zone above with the fast travel point
6.) Release your acolyte/priest guy, then wait for the phase to end wherein he fights for you (this phase is indicated by a small glimmer on the guy)
7.) Attack the guy once, then lute him to the left and jump over the spikes
8.) Wait for the guy to come to the edge on the other side of the spikes from where you are waiting, then jump back over to him. There are a couple ways you can knock him into the spikes - I chose to dodge into him and attack on contact, which tossed him into the air, then quickly jumped and attacked him in midair until he got knocked backwards and down toward the spikes
9.) Repeat steps 3-8 as needed. You may need to visit the Wak-Wak Tree in the same room as the fast travel point in order to get your victims to respawn

This guide works for me