You could make a Dimple pet at the rock cave. He would cost 2 nightmare fuel and 1 guacamole or 1 unagi (guacamole because he's green or you could make it unagi because he's Japanese). Also Reigen can make salt with phlegm from a ewecus. 1 phlegm can make 5 salt. Salt can be throw or used as a weapon. Salt can also do extra damage to nightmare creatures.

Reigen could have a perk where he gets more gold from a trade with the pig king because he's a con artist.

make mob