Eye of Oros/1.03

The Eye of Oros is purely a scouting unit that is summoned into play either through the Summoning Sphere or by a Plague Priest. They have the highest speed in the game (except for very high level Heroes) and are highly durable. Despite the in-game help tip specifically stating they have good viewing range, there are plenty of other units which actually have a better view range naturally. But with its extreme speed, high durability and good view range, it can quickly uncover "hidden map" and not even be phased by enemy proximity. Whether you're playing a version of the game with Summon Timers, or not, Eyes of Oros will always disappear after some time has passed.

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Plaguelords
The Eye of Oros is purely a scouting unit that is summoned into play by a Plague Priest. They have the highest speed in the game (except for very high level Heroes) and are highly durable. Despite the in-game help tip specifically stating they have good viewing range, there are plenty of other units which actually have a better view range naturally. But with its extreme speed, high durability and good view range, it can quickly uncover "hidden map" and not even be phased by enemy proximity. Whether you're playing a version of the game with Summon Timers, or not, Eyes of Oros will always disappear after some time has passed. Unfortunately for the Plaguelords, being summoned by their General means they wont hit the field until tier 5, where most of the hidden map would have been uncovered. However, if you take a Plague Priest into your retinue and start the game with one, then their spell to summon Eyes of Oros can be put to good use.