Cleon
Legend
I like blindsense. Alternatively, if they do have blindsight, the ooze should be seeping through the eye sockets of the corpse-y shell.
Great minds think alike, that's what I've given the Gelatinous Giant I'm working, slime-drooling eyeless sockets and blindsight.
I didn't want to suggest it for the Graymen because there's no mention of eyelessness in the description. My imagination portrays them as having eyes which are dead, grey-white orbs with little black pupils and bleached out irises, in the grand tradition of shambling zombie-style monsters.