Act IV. From yawning chasms and caves wild beasts and monsters emerge

in order to frighten _Ubalde_ and a _Danish Knight_, who have come in quest of _Renaud_. _Ubalde_ carries a magic shield and sceptre, to counteract the enchantments of _Armide_, and to deliver _Renaud_. The knights attack and vanquish the monsters. The desert changes into a beautiful garden. An apparition, disguised as _Lucinde_, a girl beloved by the _Danish Knight_, is here, accompanied by apparitions in various pleasing disguises. _Lucinde_ tries to detain the knight from continuing upon his errand, but upon _Ubalde_ touching her with the golden sceptre, she vanishes. The two then resume their journey to the rescue of _Renaud_.