Davy's Spirit Stages 1-3

You cover your body in the sea water and assume a different form. When you cast the spell, choose one of the following options, the effects of which last for the duration of the spell. While the spell lasts, you can end one option as an action to gain the benefits of a different one.

Stage 1. You adapt your body to an aquatic environment, sprouting gills and growing webbing between your fingers. You can breathe underwater and gain a swimming speed equal to your walking speed.

Stage 2. You transform yourself into a giant octopus and gains all states of a Giant Octopus unless you're in water all rolls involving movement roll with disadvantage. While using stage 2 if you try to use any other spell you will dispelled the transformation and revert to your original form. 

Stage 3.  You transform your appearance. all hair turns to tentacles, you grow webbing between your fingers and suction cups at their tips. You can breathe underwater and gain a swimming speed equal to your walking speed. while in this transformation your new tentacle can stretch and can be used to tie up enemies and shares the grip strength of hemp rope. Using this form halves movement speed but all mele attacks are rolled with advantage