Light Crystals
So far, Seth had already gone through up to two portals so he was quite calm as his body entered the green portal.
As the portal enveloped him, his body began feeling all sticky but he ignored it and prepared himself for whatever enemy awaited him on the other side.
Without suspense or drama, Seth found the sticky feeling which had latched onto him fade away seconds after he walked into the portal, and with his eyes opened, he was welcomed into a world of light green.
It wasn't that everything was green, but that the light that lighted up the location was blue but Seth didn't waste time looking into this intricacy as his eyes immediately moved to identify any life form.
He quickly looked left and right but other than Irene's whose sad expression he did not want to look at, there was no one else, and behind him was a bare wall, most likely their exit from this place.