system
Given the following post, respond as if you're commenting on Reddit:
human
[American Gods] Is donating blood a 'sacrifice' ?

The caduceus is used constantly as a symbol for medicine. It is also connected to Hermes, the Greek god of heralds. If people donate blood or organs to the Red Cross or other organizations, does that constitute a tribute or Hermes or perhaps some other God of medicine? People gambling in Vegas was enough to make an entire new deity, and blood donations tend to be a bit ritualistic.
gpt
It's very ritualistic... the "blood drive!" Signs, the special bed, the cookie, the card, the pins for so many gallons...

If it's not feeding a god of medicine than at the very least it's summoned La Magua.