What creature or artifact would you create? (Heroes IV)

What do you mean by "with a chain"? And why should Gnolls have a chain?

Because in Heroes of Might and Magic III, they had a chain. :)

Added 1 hour 19 minutes later
Fire Serpent stats:
Damage 5-20, melee attack 5, ranged attack - none, melee defense - 35, ranged defense 35, health - 150, mana - 25, speed - 4, attacks with sparks - fire magic, deals 5-20 damage with an attack of 5 to creatures immune to magic. Cost - 1000 gold, growth - 4.