1. High speed (6) allows them to quickly engage ranged units or cast spells.
2. Defense of 7. For a level 2 unit, this is a very significant stat, which again allows the gargoyle to hold out for a considerable time against engaged ranged units.
For example, 3-4 gargoyles accompanying a secondary hero can break through 10-19 grand elves in the first week (with the support of the rest of the troops, of course); without them, this task is either solved with significant losses or may be unattainable...
Rooks are good, that's for sure, 40 hit points and they are quickly summoned!

Орден Феникса – харизматический :) лидер