Promise to give him the Hybrid
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From: Light Fingers: Mr Fires' Ultimatum 4
In exchange, it offers a diamond from the Mountain of Light. And the safety of London from at least one of the Masters' schemes.
Game Instructions: You needn't keep your word, of course.
Unlocked with 
exactly 307
Success
A bargain, fairly struck
"Naturally." Mr Fires extends a gloved hand. Its grip is oddly soft and leathery. "I am glad you can see reason."
An occurrence! Your 'Ambition: Light Fingers!' Quality is now 308 - A conversation with Mr Fires!
An occurrence! Your 'Accepted Mr Fires' Ultimatum' Quality is now 1!
Redirects to: Light Fingers: Mr Fires' Ultimatum 5
