Your patron is all powerful space axolotl and gain their strange axolotl powers.

expanded spell list

The Mighty Axolotl lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

spell level      spells

1st                  longstrider,cure wounds 

2nd                 alter self,lesser restoration 

3rd                  haste,water breathing

4th                  divination,freedom of movement

5th                   contact other plane,greater restoration

un-metamorphized

starting at 1st level,your patron has kept you stuck in your kid form just like it your size is considered small and you have +10 ft speed.

great swimmer

At 1st level,you gain a 40ft swim speed and can disengage as a bonus action.

false limb

Starting at 6th level,You can detach and regrow limbs.As a bonus action or reaction to taking damage,you can disengage and detach a limb while the limb is detached you gain disadvantage on checks involving that limb.The limb flops around in the space you left and anyone who comes within 5ft of it or starts their turn their must make a wisdom save (dc of your spell save dc) or use their action to attack the limb at disadvantage (which has an ac of 14 and 15 health).As an  action while you limb is missing,you can regrow it and regain 1d6 hit points and your fallen limb no longer has any effect.You can not perform actions that require an currently detached limb and if your missing one of your legs you have disadvantage on dex saves and -5ft of speed.If you are missing both legs you fall prone and your speed is reduced by 5ft  in addition to the penalties of losing two legs.You can use this feature a number of times equal to your charisma mod (min 1) and regain uses during a short or long rest.

regenerative prowess

Starting at 10th level,as an action you can expend any number of spell slots and regain 10 hp per level of the spell slots expended.

invoke thy power so that I may return

At 14th level,When you would be dropped to 0 hit points you can detach a limb without creating a dropped form  to ignore the triggering damage.When you do this,you teleport to place within 30ftft of you of your choice and cannot do so again until you take a short or long rest.