How to kill Black Dragons?

So, my final answer: either wait for the Titans and don't bother, or forget about the Utopians, or play as Equi and rush with Nagas – as you can see, there are many options :D :D :D :D :D

Nobody plays with Whirlwinds anymore.
Besides, I didn't say that you shouldn't build Titans; you should build them, but you need to do it on days 7-10, or at most 14, but definitely not "at least one Titan by the fifth week."