[HoMM V]9 Race - Swamp! Is it needed?

The idea about the dungeon worm is good, but its speed should be reduced, or this skill should only be available during a castle siege. Also, couldn't the medusa's attack range be two cells (horizontally)? Then the snake could be made larger. In general, these snakes look like level 1 units, but you can't have a castle without flying units. It's a pity that wyverns are already taken; otherwise, they could be level 6, medusas level 5, followed by gnolls, lizards, troglodytes, and snakes. P.S. As for the elemental castle, it would be better to use Nigon instead. Although there are no more monsters left.