Can those who have the game now...

[Teleolurian]

The long disclaimer I edited out:

Magic sites are more elusive when searching by this way and a very powerful mage is required to find those that are well hidden. Mages are usually able to stay hidden from the projected mind if they have a good magic resistance value. If an Astral mage is found, a battle of the minds will ensue. Only one will leave it with their mind intact. Other mages cannot try to retaliate, but neither do they risk losing their sanity in the process. However, they will be subjected to a minor Mind Burn attack if they are found.

Lasts until caster is killed, feebleminded, or dispelled (the enchantment, not the caster).

Sorry. The 5-mile radius thing was just a colloquialism for 'a lot of space'. The in game effects are apparently your entire dominion.