Enough! Burn them!
From Fallen London Wiki
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From: Shed your Phosphorescent Beetles
No more chittering! No more scuttling! Burn them! Burn every last one!
Game Instructions: This will always gain you many Memories of Light.
Unlocked with 
500 x Phosphorescent Scarab
Success
Crisped wings and smoke
The smoke is a window, (…), a peephole. You can see something. A verdant light seeping through into the parlour. Perhaps you knew this would happen. Perhaps you knew that each scarab holds a shard of that world, the world on other side of the mirror.
You've lost 500 x Phosphorescent Scarab
You've gained 105 x Memory of Light
