SPELL                        Group: Transportation
The portal spell is similar to gate, but creates a lasting 
one-way portal to the target creature, instead of transporting 
the caster.  Portals are entered using 'enter' or 'go' command, 
as in 'go portal'.  Portals cannot be made to certain destinations, 
nor used to escape from gate-proof rooms.  Portal requires a 
special source of power to be used, unfortunately the
secret of this material component has been lost...  

Classes and levels for portal:
mage        : 66  cleric      : 65  thrall      : 65  
sorcerer    : 46  bishop      : 45  vampire     : 45
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