Affix the Helical Thighbone to your (Skeleton Type)

Wiki note: The title of this option varies with its number of fins and Torso Style and Menace qualities:
Affix the Helical Thighbone to your

Skeleton: Fins	Text
0	Finless
1	Single-finned
2	Double-finned
3	Triple-finned
4	Quadruple-finned
5	Five-finned
6	Six-finned
7	Seven-finned
8	Eight-finned
9	Nine-finned
10	Ten-finned

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: 242529

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

From: Assemble a Skeleton

Endow the creature with some Rubbery personality.

Game Instructions: This will always give at least one point of Amalgamy, but will give two on success.

Unlocked with Skeleton: Limbs Needed, 1 x Helical Thighbone

Locked with Skeleton: Skulls Needed

Challenge information

Narrow, Shapeling Arts 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%)
  

Success

Unusual joints

A leg like this would have to support an unusual walk. An unusual walk requires an unusual joint. You spend several hours working with the beast's pelvis, discerning just how it might have been structured to enable an exceptional mobility.

•  You've gained 300 x Approximate Value of Your Skeleton in Pennies
•  You've lost 1 x Skeleton: Limbs Needed
•  You've gained 1 x Skeleton: Legs
•  You've lost 1 x Helical Thighbone
•  You've gained 2 x Skeleton: Amalgamy

Failure

An ordinary leg

It is hard to imagine how this creature might have walked, given the torsion on the bone and the placement of the foot. You do your best to give it a plausible angle, but it doesn't quite persuade.

•  You've gained 300 x Approximate Value of Your Skeleton in Pennies
•  You've lost 1 x Skeleton: Limbs Needed
•  You've gained 1 x Skeleton: Legs
•  You've lost 1 x Helical Thighbone
•  You've gained 1 x Skeleton: Amalgamy