Nidhogg

Nidhogg is a powerful dragonlike unit available only to the Norse who worship Hel in the Mythic Age.

Strategy
This Myth Unit deals splash damage to masses of enemy units in a certain area, and is also great as a substitute for Siege Engines. The huge number of hit points and high armor gives this unit powerful advantages in combat. As a flying unit, only ranged attacks can hurt him but it will take a large amount of them to take the Nidhogg down. Due to his large amount of crush damage ranged buildings will fall quickly as well. Due to its flight ability and high amount of damage is a good Titan killer.

However the Nidhogg is not invincible. He has no regeneration, and cannot be healed by any method, so ranged heroes can effectively kill the Nidhogg and, without support, it can be taken down by an enemy army fairly quickly. Due to their ability to cause splash damage Titans will also deal damage to them if they get too close. Zeus´s bolt  can also kill the nidhogg. Because all of this, the player must have in mind to protect the nihogg with an army and avoid to engage  a Zeus player with the nidhogg directly.