Use a Carved Ball of Stygian Ivory to cap off your (Skeleton Type)

Wiki note: The title of this option varies with its Torso Style and Menace qualities:
Use a Carved Ball of Stygian Ivory to cap off your

Skeleton: Torso Style	Text
10, 15	Human
20	Thorny-Breasted
30	Seven-necked
40	Many-limbed
45	Segmented
50	Mammoth
55	Luminous
60	Baroque
70	Deep-water
80	Prismatic
100	Starved

Skeleton: Menace	Text
0	Creature
1	Animal
2	Beast
3	Monster
4	Monstrosity
5	Demon
6+	Abomination

A player-created Guide is available for this content: Assembling a Skeleton (Guide)

How are the above links here?

ID: 242498

Spoiler warning! This page contains details about Fallen London Actions.

From: Assemble a Skeleton

It's not a skull. It won't look like a skull. It may, however, look as though the spine ends naturalistically at a certain point.

Game Instructions: This will be harder to achieve if the skeleton has no other skulls. It adds nominally to the value of your skeleton but will not increase Menace, Antiquity, or Amalgamy.

Unlocked with Skeleton: Skulls Needed, 1 x Carved Ball of Stygian Ivory

Challenge information

Narrow, Mithridacy 5 (50% base)

• 1 and below - almost impossible (10%)
• 2 - high-risk (20%)
• 3 - high-risk (30%)
• 4 - tough (40%)
• 5 - very chancy (50%)
• 6 - chancy (60%)
• 7 - modest (70%)
• 8 - very modest (80%)
• 9 - low-risk (90%)
• 10 and above - straightforward (100%)
  

Each point of Skeleton: Skulls reduces the base difficulty by 1 point.

Success

It has a superficial credibility

It looks like a knee-cap, perhaps. If any animal had such a thing at the end of its neck.

•  You've gained 250 x Approximate Value of Your Skeleton in Pennies
•  You've lost 1 x Skeleton: Skulls Needed
•  You've lost 1 x Carved Ball of Stygian Ivory

Failure

Not entirely effective

The result is very like putting a knob at the top of a walking stick.

•  You've gained 250 x Approximate Value of Your Skeleton in Pennies
•  Your skeleton has become less believable. (Raises Skeleton: Self-Evident Implausibility by 2)
•  You've lost 1 x Skeleton: Skulls Needed
•  You've lost 1 x Carved Ball of Stygian Ivory