Amulet of the Ooze

While attuned to this amorphous green amulet, you know the following spells and can cast them without material components: wall of ooze*, ooze cocoon*, gaseous form, and acid splash. 

Additionally, once per long rest, you may cast one of this amulet’s spells without expending a spell slot. 

*These spells are exclusive spells of Shuvnir-kegu’s own design. You must pay him 5 bazan in royalties whenever you cast them.

Notes: by a spellcaster