...while I think that's a stupid attitude for a god of medicine to have, I'll try a different approach here.
Do you think this is going to stop at one plague? Titans are not our friend. We're setting a precedent here, showing we're pushovers. It's like broadcasting a signal to all the titans everywhere that they can just walk over us, and that this is the perfect planet to crush and destroy. If we don't come down on this titan like a hammer, he's going to go to all his titan friends and tell them he's found a perfect planet to mess with. We very well may not have a planet left at the end of it. Think about what you're doing please.
Did you guys ever consider what actually caused the gods of that other planet to fail? 7 out of 10 odds it was titans. Do you guys want to be like those loser gods? Do you?
According to the IC description of Titans, all that we know is that :
Titan: These powerful beings have existed as long as the gods, but are very crude in their existence and creation abilities. They often appear as a loosely constructed being made out of one element or another and their ability to interact with the material world is lacking. Plus, they hate the gods. If a titan is coming to the gods, they must really want something.
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-They hate Gods
-They seem established as Creation entities.
-They are powerful, but have very crude abilities.
Anything beyond this is speculation, so we don't even know if Titans will actively try to destroy gods, if they are malevolent, true neutral, or follow some grander scheme.
There are many answers we could give to the coming Titan, all with potential advantages and disadvantages :
1) Give him a Tribute
> Depending on the Titan mentality, it could establish us as "weak" and/or "cold-headed". The Titan could leave with maybe a feeling of respect or decide indeed those Gods are fools that can be milked.
2) Attack him
> Depending on the Titans mentality, it could either work for us by establishing us as "strong", or completely backfires by establishing us as "rebellious and dangerous", bringing upon us more and more angry Titans.
3) Speak with him
> He was established as not particularly bright. Is it a bluff or the truth ? We don't know.
So if we speak to him, anything could happen from managing to convince him of letting us alone, making him an ally, or even learning more about Titans themselves.
4) Ignore him
> Will establish us as "Unimportant" or "Frustrating", which could either bring more problems or actually give us some peace. Of course, the plague would be unleashed.
edit:
5) We could also try negotiating with him, though it is more another branch of 3). It could also be interesting to make a counter-offer to the Titan, proposing him 15 or 20 IP in exchange of information or power.