Obelisk

Obelisk is an Adventure Map location, that can be visited by a hero to reveal a piece of the Puzzle Map. The Puzzle Map reveals the location of the Grail piece by piece. There are eight different colors of Obelisks, that are red, green, light blue, dark blue, brown, purple, white and black. On randomly generated maps the colors are tied to terrains:

Shadow of Death	Dirt	Sand	Grass	Snow	Swamp	Rough	Subterr.	Lava
Horn of the Abyss	Dirt	Sand	Grass	Snow	Swamp	Rough	Subterr.	Lava	Highlands

If the creator of the map has placed obelisks in the map, but no Grail, a Grail location will be set randomly.