PORTAL

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Syntax:  cast portal <target>

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 known as a warp stone.  Most of these are
single use and are consumed by the casting energies of the spell... but a few
rare warp stones exist that can be used more than once before they vanish into
nothingness.

SEE ALSO: TRANSPORTATION, NEXUS, CASTING