Wheatsea Demon Cave

Two issues with this cave:

1)  I *know* there's a VC command to close the dark realms portal in the cave, I've used it a few times before many years ago.  However, I can't remember what it is, and there is absolutely nothing in the cave to even hint that the portal is closable, much less what the VC command is.

2) The environmental heat damage... Something about this script caused me a HUGE amount of lag, far greater than any other environmental damage trigger.  I am completely certain it's the environmental damage because as soon as I left the trigger, the lag ceased.  As soon as I re-entered the trigger and started taking fire damage gain, the lag returned.