Shapeshifting size

Cirein-cròin

The most remarkable feature of the Cirein cròin is its ability to alter its size at will, a characteristic that makes it an exceptionally dangerous predator.

Takshaka

In the account he intercepts a physician travelling to protect the king and turns him back, then has his followers approach in the guise of ascetics bringing fruit, concealing himself within one of the offerings as a small worm.

Rakshasa

Rakshasas are credited with formidable magical powers, including illusion (maya), flight, and the ability to change size and shape at will, and many are granted near-invincibility through boons won by ascetic penance (tapas) to gods such as Brahma or Shiva, as Ravana himself does.