Astral disruption

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In the Ages before the Shattering, astral travel was a common occurence.
With the exception of areas guarded by magic, almost any location 
throughout the Realms was accesible via these varied forms of transport.

With the death of Il'liara and the horrific effects of the Shattering, the
fabric of the astral plane was torn. Astral transport now requires many
shorter steps to move from place to place. Magickal theorists have attempted
to discover why some movement between two localized locations is sometimes
impossible while large leaps are sometimes made effortlessly. For now, no
conclusions have been reached.

Definition

Since the Shattering, Planar spells now have a reduced range because of astral disruption. All these spells have been limited to the surrounding Geos or to only the Geo itself.

The spells:

• Augurer: Helical flow
• Cleric: Solar flight, Uplift
• Druid: Plant pass
• Mage: Astral walk
• Vampire: Mistwalk

Limited Geos (Planar spells cannot be cast into or from outside these geos):

• Air
• Azure sea
• Blood sea
• Otherlands
• Western Trade Route
• Eastern Trade Route
• Northern Trade route