Teleporter

You have gained the ability to slightly manipulate space teleporting short distances and view nearby planes of existance.

Short Distance Teleport

Beginning at 3rd level, As a bonus action you can teleport a number of feet equal to half your movement speed. This consumes your movement as normal, if you teleport next to a creature and hit it with an attack with a finesse weapon you are able to use your sneak attack feature.

Ethereal Reach

Starting at 9th level, You gain the ability to peer into the ethereal plane and reach it. As an action you may begin peering into the ethereal plane, whilst peering into the ethereal plane you can see creatures in the ethereal plane and attack them, thou they can also attack you and you have half movement, disadvantage on perception checks whilst peering, you can stop peering as a bonus action on your turn.

Spacial Bind

By 13th level, When you damage a creature with your sneak attack feature you bind them into the current plane of existance for 1 minute or until you use this feature on somebody else, whilst bound in this way the creature cannot move from one plane or teleport unless it passes a Charisma saving throw (DC 8 +your proficiency + your intelligence modifier) on  a pass it breaks the spacial bind and is able to move to another plane or teleport, on a failure it cannot move to another plane or teleport.

Long Range Teleport

When you reach 17th level, Thanks to your mastery of space You are able to cast the teleport spell once per long rest.