Sekiro Fastest EXP Grind - Extended Antechamber Rotation. 325exp/s on NG++
This is what I believe to be the fastest exp grind in Sekiro. It starts at the Antechamber Idol. When you first do the run, sneak around to kill the first guy then clear out the first room of all objects that can alert him, they will not come back after resting and makes killing him much faster/easier.
Then run and agro the Ogre with Shuriken, who will take about 10-15 seconds to kill the 2 npcs next to him, giving you their exp. In the meantime, jump to the rafters and dive bomb the other ninja, run back, rest repeat.
EXP on NG++
3156 x 2 for the ninjas
2702 x 2 for the ogre kills
Total exp = 11716 per run.
Avg run = 36 seconds
EXP = 325 per second on NG++
On the final run in this video I miss the final ninja, just run back to the idol and repeat. You still get the ogre exp for a total of 8560 exp in the same 36 seconds, or 238 exp/second which is still quite good.