Be instructed in the traversal of mirrors
From Fallen London Wiki
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From: Feline Expeditions into Shadow
The offering of small kills is still an important part of their ritual. Prove yourself a good hunter, and you will be shown all.
Unlocked with 
Base Glasswork 5, 
5 x Baptised Rattus Faber Corpse
Locked with 
Glass Studies
Success
The nature of the training
[…] offer guidance on which paw to lick before stepping through a mirror, and the angle of one's tail when passing through the Viric Jungle. As a matter of tradition and courtesy, they give you even the instructions you will not be able to use.
[Find the rest of the story at https://www.fallenlondon.com]
Your maximum Glasswork is now 6. (Sets 
Glass Studies to 1)
You've lost 5 x Baptised Rattus Faber Corpse
