if you aren’t incapacitated, you can choose to magically step into the veil between the planes.

You can move through other creatures and objects as if they were difficult terrain, as well as see and affect creatures and objects on the Ethereal Plane. You take 1d10 force damage if you end your turn inside an object (or are stay inside one for more then 6 seconds). If you are inside an object when this feature ends, you are immediately shunted to the nearest unoccupied space that you can occupy and take force damage equal to twice the number of feet you moved. This feature lasts for a number of rounds equal to your Intelligence modifier (minimum of 1 round).

Ghost Sight: Once per long rest while in your ghost form you can cast the "Detect Evil and Good" spell, this can only be used to see undead.