you get +2 dexterity and +1 wisdom

after 1 minute of channelling your power you can switch between ghost mode and living mode. while switching everything that is soulless and is part of your body transforms with you 
(clothing, weapons, items, all that sort of stuff)

Ghost mode

- you cannot interact with the physical world

- you can only see in shades of blue/purple

- you are immune to any type of non-magical damage (piercing/slashing/bludgeoning)

- you can enter the body of any willing creature to seek shelter. you gain blindsight while inside another creature (any damage that creature takes is split between the 2 of you rounded down. when the host takes damage con save dc 13 to stay inside host)

living form

- you can do the same as a normal human (racial traits from your previous race are gone)

The item that is soul bound to you is very important and has a few quirks.

- when entering ghost mode you drop this item, if you want to move it your speed drops to 5ft

- when in ghost form you cannot fly further then 10ft away from it (+10ft at lvl. 5,9,14,20)

- when your hp drops below 0 your soul seeks shelter in your item of choice. you still make death saves

- you can freely go into your item. when in your item you have blindsight 30ft

- when your item takes damage, the damage gets redirected to you

your soul is delicate and needs to stay healthy without relying on the physical stuff

- as a action you can choose to heal (class die x class level / 2) you can only heal once per long rest and when you healed everyone gains advantage while attacking you

- while inside another body or your soul bound item you regain passive health
another body
you regain 1d4 every turn but the host loses that hp

you can also give the host 1d4hp every turn (doesn't cost you hp) (due to adrenaline shots this only works in combat)
soul bound item
you regain (class die) every hour (after 8 hours you get a long rest)