An excerpt from The Blue Ruby Rose.
'When the dust had cleared, both Azael and Sylva had survived this ghastly event. By now, the calm and collected Azael was beginning to get irritated by all of the dead-ends he was facing, especially now that an arrow had scraped his ankle, which he wrapped with a piece of his tunic. He now had a more determined attitude. He set his mind to do what he came for, and that lays in the final choice - the right path at the fork in the road. He got back onto the gravel road, and proceeded to the fork. There, he pulled out his daggers and began sharpening them by rubbing them with each other. From there, he went into the right trail, walking confidently and unafraid of any traps. But he didn't get far when his feet activated a trip wire. He jumped backwards on impulse, and fell on his back and elbows. There was the sound of a few pebbles being shuffled from here and there from the sides of the hill in which the trails were found. Some even made it to scramble across the gravel floor, in front of Azael and Sylva. It then ended in complete and udder silence, just like back at the king's bedroom. He began to get up, but he heard a deep rumbling. So, he rose to one knee, planting the other foot in front for support. He also pulled out his bloody long sword, and brought it up over his head, pointing forward. Armed and dangerous. The rumbling then stopped, and it seemed to have been a mere hoax set up some time ago by some young, ambitious, and troublesome cleric who experimented here. Seeing no danger present, Azael got up to both feet, limping a little, and turned around, only to find that a small room emerged from nowhere, along with the tune of somebody whistling, but no person was visible. The room was small, with only one chair: It had the appearance of a chair inside a thick hollow tree trunk, with a small door on the opposite side. He got closer and Sylva noticed something, so she reported it to Azael, who turned back around, moving to the left side of the mountain, when his ankle caused him to fall down from all the pain.'
The 'door' happened to be a portal, but it was not yet activated at that time in the story.