Younger Sister

"The Mother of Ants was born among serpents. She has so very many younger sisters. It can be defeated in battle; or it will respond to the Mother's power."

- In-game text

 is an Obstacle appearing during Expeditions. Its Aspect is Guardian.

Defeating
"The Serpent watches us closely, swaying its great head. Without Edge or Knock, we cannot prevail against it."

- A Younger Sister: a Serpent (when confronting the obstacle)

As hinted by the description, Followers with or  aspects can overcome this Obstacle with a probability depending on the aspect magnitude.

"The Serpent rolls and roars! Its death throes shake the earth! But it's dying. We will pass."

- The Serpent's Struggles (after success.)

Our strength...
 * 1 < < 5: ... may not be enough.. Eyes like gas-lamps; a mouth one could crouch in. We might defeat this Serpent. We might regret trying. 30% chance of success.
 * 5 <= < 10: ...is considerable. Eyes like gas-lamps; fangs like stalactites. A great Serpent is a powerful foe, but so are we. 70% chance of success.
 * 10 <= : ...is matchless. Eyes like gas-lamps; scales like black jade. A Serpent is a powerful foe, but it's nothing before us. 90% chance of success.

"It lowers its great head. Moisture seeps from its lidless eyes. Is it weeping? What does it remember of its eldest sister, whose power we call upon?"

- The Serpent's Sorrow (after success.)

We call upon the Mother of Ants,...
 * 1 < < 5: ... which openeth. The Serpent rears up like swelling river. Its eyes are slitted pits of hunger. Perhaps the Serpent will respect the power we bear. 30% chance of success.
 * 5 <= < 10: ... which encircleth. The Serpent is long enough to coil round a cottage. Its fangs glisten like ice. Probably it will respect the power we bear. 70% chance of success.
 * 10 <= : ... which ariseth from wounds. The Serpent's mouth is large enough to crouch in. Its tongue is the thickness of a man's shoulders. But almost certainly it will respect the power we bear. 90% chance of success.

Failure
"Back. Back! It's too much for us!"

- The Serpent's Strength (after failure)

Failing to defeat the Serpent has a 70% chance of injuring a Follower.