RTF is a global modification that replaces all towns in the game.

And I also think that entangling roots won't be very effective for Simurghs, as it's more suitable for slow tanks like Ents.

That's right, entangling roots will be useless for Simurghs because they move from place to place, and I wouldn't even classify them as tanks; entangling roots are meant for Ents so that enemies stand near them and can't reach others.

Added 1 hour 16 minutes ago
For Simurghs, entangling roots are like a rotten apple on a hedgehog's back. Just extra weight.