create planet

after talking to a deity and it takes your offering of 5000gp it grats you the power to  create a planet the size of a moon. you shape what is on your oasis example(grass,sand,trees,rock,mountains,hills,oceans,lakes etc) as a druid spell you can create passive life such as sheep,cows or humans but as a wizard spell you can create monsters dragons,owlbears,mimics and mind flayers to protect your home all are under control of you but they must be under a challenge rating of 15 but a monster like a young dragon can become an adult witch has a challenge rating higher then 15 but as long as it started as a fifteenth level creature

if the spell caster dies either the planet explodes into a powerful glowing light giving the  deity that helped you gains 100 temporary hit points or stays there without a ruler