I'll be watching you when a vampire flies into your hole.
If it's not clear, let me explain: elves are blocked by ents, leaving a space for a phantom. On the first turn, no one can break through; a phantom is placed. That's it.
In the final stage, you can act similarly, depending on the chosen tactic. The question is whether the opponent will have time to counter the phantom with area-of-effect chaos spells or arrows. If not, then the game is over.