All 5th edition spells in the Underdark circle.
“Gaseous form or wraithform (originally called Quantoul's wraithmorph) was an arcane...Gaseous form
“Stone shape was a transmutation spell or alteration spell that reshaped stone objects. Fine...Stone shape
“Stinking cloud, originally called Tolodine's stinking cloud, was a conjuration spell that...Stinking cloud
“Greater invisibility or improved invisibility was an illusion spell that functioned exactly like...Greater invisibility