Ardin's Borrowed Power

You attempt to temporarily borrow the power of a monster you've seen before. The monster can be of any creature with a challenge rating equal to your level or lower. Make an arcana check. The DC equals to twice the monster's challenge rating or 10, whichever is higher. On a success, you may use the attacks, features and movements the monster has but not any class features, as your body changes to match the shape of that monster. You may not use the multiattack feature if the monster has one. On a failure, you transform into a random creature as you fail to remember the form and powers of that monster. Roll a d12 to determine what you transform into.

|   d12 | Monster
|-------+---------------
|     1 | Air Elemental
|     2 | Fire Elemental
|     3 | Water Elemental
|     4 | Earth Elemental
|     5 | Mammoth
|     6 | Giant Ape
|     7 | Tyrannosaurus Rex
|     8 | Star Spawn Hulk
|     9 | Giant Whirlwyrm
|    10 | Mind Flayer Clairvoyant
|    11 | Roc
|    12 | Firemane Angel