Insubstantial Sneak

And Insubstantial Sneak is a rouge, who through some magical means, (such as a celestial casting a spell on them when they were young, or they were bathed with holy water) the rogue has gained the ability to turn itself and it’s equipment insubstantia, allowing it to infinite possibilities.

Insubstantial Body

From now on, you can turn your body insubstantial. You can do this twice per day, for 10 minutes each. The number of times increases every by one every level. While in this form, you can pass through walls, floors and other solid materials. You have resistance to slashing, piercing and bludgeoning damage. It’s a bonus action.

Insubstantial Weapons

Whenever you use insubstantial Body, your weapons also become insubstantial, and you gain advantage on every 3rd attack you make, and your sneak attack does extra 1d6 damage.

Insubstantial Dexterity

After being insubstantial so often, you find manoeuvring in your normal body very easy. When in either of forms, double your proficiency bonus in any kind dexterity check, from saving throws to dexterity skills. Not in dexterity attacks however.

Insubstantial Duplicate

Whenever you use insubstantial body, you can expend 4 uses of insubstantial body to make a duplicate of you which lasts till your insubstantial body endS. You control it every turn as a bonus action.

Insubstantial Posession

When using Insubstantial Body, you go inside any other creature. The creature must succeed on a DC 17 Wisdom Saving throw, or be controlled by you till your Insubstantial Body ends or not. If it succeeds, you take 4d6 psychic damage.