Well, let me tell you, it was quite a challenge. I spent about three hours fighting them. I don't understand how you managed to defeat them without using ranged attacks. I barely managed to defeat them with the Sling, and I even used your battle description as a guide, doing almost the same thing: Vampire, Sadist, and one unit at a time through the tunnel. At the end of the battle, I had only 8 mana left.

You read the battle description, right? I just timed my exit from the tunnel and managed to hit each group of Satyrs. Then I ran around in circles and returned to the tunnel :)

Also, remember that the vortex will sweep units off the edge, so don't let boats with two Vampires get caught in it, or one of them will be swept away.

I always keep that in mind :) That's why I need at least three boats. But I'll have many more :)

You shouldn't have used the Cerberus for the chest; it would have been better to take the Necropolis right away.

You're right, but I think I can still get another one in time to take the Necropolis on turn 8, and since there are 4500 resources there, it's all good. I'll build more boats and transfer units from the one I'm in to all of them. It seems to take about two days to reach Chaos, so my main goal is to complete it within that time :)
And how much mana do you gain per turn, and how much do you have at the start of turn 5, since you said you're developing your strategy for the fifth turn.
PS. I just checked the Necropolis with a scout :) I'll have to run around with the Cerberus for a while :) But it's worth it - on the 8th day, they give you five thousand resources :)