Change Reality

Once per long rest and at the cost of half of your hit dice (if odd then round up), change one creature or object you can see into something else, determined by the outcome of a D20:

1. A frog
2. A chair
3. A goblin 
4. A vampire lord
5. A pile of 200 gold pieces
6. Nothing (It ceases to exist)
7. A set of iron armor
8. A chromatic dragon of the GM's choice
9. A portal to the ancestral plane
10. A detonation of the spell "fireball"
11. A bucket of fish
12. A wheel of aged limburger cheese
13. A beholder
14. A forest rabbit
15. A mimic
16. A pile of double barrel shotguns
17. A pack of giant spiders
18. A bugbear
19. A lit torch
20. A swarm of bats