Bardic Inspiration (3/Short or Long Rest). As a bonus action, the attendant can grant an ally that can hear it a d8 inspiration die if it doesn’t already have one. Once, within 10 minutes, the target can roll the die after rolling an ability check, attack roll, or saving throw but before the GM declares success or failure. The result is added to the total.

Eldritch Symbolism. The attendant has advantage on Intelligence (Arcana), Intelligence (Investigation), and Wisdom (Perception) checks to notice, identify, or bypass magic writing and magic traps. It also has advantage on saving throws against magic traps and the effects of magic items.

Spellcasting. The attendant is a 7th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). It knows the following bard spells:

Cantrips (at will): message, minor illusion, vicious mockery

1st level (4 slots): disguise self, hideous laughter, sleep

2nd level (3 slots): see invisibility, shatter, suggestion

3rd level (3 slots): fear, song of Hastur, speak with dead

4th level (1 slot): greater invisibility, Yellow Sign

Turning Defiance. The attendant has advantage on saving throws against effects that turn undead.

Dagger. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 5 (1d4 + 3) piercing damage.

Spellcasting. It can use its action to cast a spell. (It will always attempt to cast the Yellow Sign, capture it's enemies attention, then expose them to the Song of Hastur).

It can expend two Bardic Inspiration dice to cast glyph of warding without expending a spell slot as an action.