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You're chalk full of chalk... err, chalk full of... chock full of nanites. They're doing a pretty good job repairing you, so it's probably best to just let them do their job and not think too hard about how you have millions of tiny robots crawling through your body.
Gah! Now I'm thinking about it.
+10% to your maximum Hit Points
+5 HP per turn
Bolsters your Defense when the city is under attack
- syringe of nanites (60 minutes)