Town Portal

School of Earth Magic
Level 1
Magic Arrow *
Shield
Slow
Stone Skin
View Earth
Level 2
Death Ripple
Quicksand
Visions *
Level 3
Animate Dead
Anti-Magic
Earthquake
Force Field
Protection from Earth
Level 4
Meteor Shower
Resurrection
Sorrow
Town Portal
Level 5
Implosion
Summon Earth Elemental
School of Air Magic
School of Fire Magic
School of Water Magic

Town Portal
	School:	Earth Magic
	Level:	4th
	Cost:	16
	Duration:	instant
Basic Effect
Adventure Map Teleport, casting hero is teleported to the nearest allied town. 300 movement points are expended when the spell is cast.
Advanced Effect
Adventure Map Teleport, casting hero may teleport to any allied town with no visiting hero. 300 movement points are expended when the spell is cast.
Expert Effect
Adventure Map Teleport, any allied unoccupied town,deducted movement points are 200 points.
Probability of occurrence (%):
Castle
Rampart
Tower		(*)
Inferno
Necropolis
Dungeon
Stronghold
Fortress
Conflux
Cove
Factory
Bulwark
* Without Library

By default it teleports the casting hero to the nearest allied town. However, if the hero has Advanced or Expert Earth Magic, Town Portal telports the hero any allied town. The hero cannot teleport to town which has a visiting hero.

Discussion

Town Portal is one of most powerful spells in the game, as it allows hero to travel immense distances instantaneously. Therefore it is often banned in multiplayer or tournament games.

Basic Town Portal does not seem to work if you are underground and all of your castles are above ground.