Cloud Ladder

You can mould and shape ordinary smoke into a 20-foot tall, misty ladder by reaching into the smoke and casting the spell while shaping the ladder. The ladder weighs virtually nothing and one person can easily handle a cloud ladder of any length. The ladder is always steady and rigid, never needing support or to be leaned against any object as you simply place it in the desired position and climb. Only you and one other creature (designated by you) are able to climb up the ladder. Before the end of the spell, you are able to cast the spell on the already present cloud ladder in order to maintain it for an additional duration of the spell.

At Higher Levels. When this spell is cast using a 2nd-level spell slot or higher, the ladder can be 10 foot longer and allow one additional creature to climb it for each spell slot above 1st.