You rend the fabric of space. Through the wound you expose a portal to a dark plane. This has two effects.
First, you teleport yourself from your current location to any other spot within sight.
You can bring along objects as long as their weight doesn't exceed what you can carry. You can also bring one willing creature of your size or smaller who is carrying gear up to its carrying capacity. The creature must be within 5 feet of you when you cast this spell.
Second - the path, including the starting and end points, becomes twisted by the presence of the tear in reality and exposure to the endless empty void normally hidden from mortal sight. All creatures except the caster and objects or creatures brought with him incur the following effect in a 5 feet wide line. Each creature in the line must make a Dexterity saving throw. A creature takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one. In addition any creature that fails it's save gains a level of exhaustion.
* - (A diamond worth at least 100gp or the skull of a unicorn)