Dandara: Trials of Fear Edition

World map:

The best place I've found to farm souls is at the farthest right camp (Intention Square) once you have the second main progression item, although it is vastly sped up if you also have the third. You can spawn at the camp, jump out to the upper left exit, quickly kill all the enemies in this room, then head back right and loop back to the camp, killing the one enemy along the path. I would recommend having at least one arrow upgrade to kill the enemies in two shots. Took me about 40 minutes to grind from zero salt.

This is easily done in around 20 minutes(if you start with 0 salt) by the end with Johnny B. Missiles, at the Guardhouse camp(the camp that's right next to the final boss area). Remember to ignore the circular enemies as they give you so little salt. An optimal run takes just under a minute and gives you 1090 salt

Go to the camp and take the southern exit; spam the missiles at the triangle enemy to the left(if you're quick enough it won't be able to fire a single triangle!), go down a 'floor', and spam missiles at the triangle enemy there. Go down yet again to activate the staff enemy, and flip the platform so you're back up again. If the staff enemy is in the right position you can shoot it with your missiles, if you can't shoot it then go up one 'floor' and the staff enemy will be out in the open to receive your missiles. Once it is dealt with go back down, and exit to the right(if the sawblade blocks the platform then you can either choose to take the damage from it and go down, or take the platform to the left. Now take the two platforms to your right and go to the platform on the roof, hanging upside-down, where you'll kill the staff enemy from. Now go up and kill the scythe enemy. Take the exit above you and go up a 'floor' and kill the staff enemy. Take the exit to your left and loop around to the camp.