Vilma waits at the door, letting her allies pass but ready to strike at a sign of the creature approaching.

"Then come, I'll hold it here ! Or dispel its invisibility ?"

Spoiler: OOC
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I'll ready an attack. Since the creature is so noisy, it'll be when it arrives in melee range, with Risky Strike.

Attack - (1d20+9)[18]
Damage - (1d8+12)[20]