How about a dimensional rift spell that takes the caster and a target and puts them randomly in a room? Yes, I know it's a poorman's global summon or goto command, but here, the caster has no control the location. Just like teleport. So maybe call it teleport summon. I don't care.

It could have a restriction of being cast only once every 6 hours or so, it doesn't autoattack so unless you wind up somewhere nasty like the maus or whitecloaks, the target could simply walk off or recall after a 1 or 2 round disorienting lag wears off. I would ensure that the target has the ability to enter a command first too, but pets could auto. The spell doesn't bring groupmates. A bad cast could teleport you randomly with an aggressive mob after your butt. And so on.

Or I guess this could be an edge to tesseract. I just like the dynamic of both of you winding up in a random location.