Monolith One Way Entrance in Heroes 3

Maps that place it

• Oblivion's Edge
• Culling the Weak×2
• Savaging the Scavengers×4
• Blood of the Dragon Father×4
• Razor Claw×2
• March of the Undead×3
• Lost at Sea
• Here There Be Pirates×2
• Hurry Up and Wait×7
• Faerie Dragons×2
• Azure Dragons×3
• Crystal Dragons×8
• Black Sheep
• Grave Robber
• Fall of Sandro×4
• Invasion×2
• Barbarian Brothers
• Clearing the Border×2
• After the Amulet×3
• Retrieving the Cowl×2
• Tunnels and Troglodytes
• Greed×3
• Master×5
• Kreegan Alliance×2
• With Blinders On×2
• The Grail×2
• The Road Home
• Falor and Terwen
• Adventures of Jared Haret
• All for One×2
• Back for Revenge (Allies)×8
• Back for Revenge×8
• Battle of the Sexes (Allies)×4
• Battle of the Sexes×4
• Carpe Diem (Allies)×6
• Carpe Diem×6
• Caught in the Middle (Allies)×8
• Dragon Orb×2
• Dragon Pass (Allies)×2
• Dragon Pass×2
• Faeries!×4
• Freedom×3
• Good Witch, Bad Witch
• Heroes of Might, Not Magic (A)
• Heroes of Might, Not Magic
• Holding the Middle
• Jihad×8
• Judgment Day×3
• King of Pain×2
• Land of Titans (Allies)×2
• Land of Titans×2
• Middletown×3
• Myth and Legend×2
• Noah's Ark
• One Bad Day (Allies)×5
• Overthrow Thy Neighbors×3
• Pandora's Box×4
• Peaceful Ending (Allies)×6
• Peaceful Ending×6
• Pestilence Lake (Allies)×6
• Pestilence Lake×6
• Race for Ardintinny×6
• Realm of Chaos
• Realm of Chaos (Allies)
• Reclamation (Allies)
• Reclamation
• Sangraal's Thief (Allies)
• Sangraal's Thief
• Serpent's Treasure
• South of Hell (Allies)×3
• South of Hell×3
• Tale of Two Lands (Allies)×2
• Tale of Two Lands×2
• The Five Rings×4
• The Gauntlet
• The Mandate of Heaven×2
• The Newcomers
• Thousand Islands (Allies)×6
• Thousand Islands×6
• Treasure Hunt×8
• Undead Unrest
• Unholy Quest×3
• Valleys of War
• Vial of Life×2
• War of the Mighty (Allies)×4
• War of the Mighty×4
• When Dragons Clash×4