The installation has a portal or gateway to another dimension or dimensions. This can range from an otherwise innocuous-looking door to a humming high-tech portal surrounded by support equipment and monitors. The portal provides two-way travel to and from the other dimension, and it may even reach a number of related dimensions. At the GM’s discretion, an appropriate skill check—typically Expertise or Technology—may be required to operate the portal.


D20 Hero SRD Installation Article-

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