vcmi/config/objects/coverOfDarkness.json

{
	"coverOfDarkness" : {
		"index" :15,
		"handler" : "configurable",
		"base" : {
			"sounds" : {
				"visit" : ["LIGHTHOUSE"]
			}
		},
		"types" : {
			"coverOfDarkness" : {
				"index" : 0,
				"aiValue" : 100,
				"rmg" : {
				},
				
				"compatibilityIdentifiers" : [ "object" ],
				"visitMode" : "unlimited",
				"rewards" : [
					{
						"message" : 31,
						"revealTiles" : {
							"radius" : 20,
							"surface" : 1,
							"subterra" : 1,
							"water" : 1,
							"rock" : 1,
							"hide" : true
						}
					}
				]
			}
		}
	}
}