Only Loki, through his servant Hel, can summon the mighty dragon Nidhogg from his lair beneath the roots of the world ash, Yggdrasil.

Nidhogg flies slowly, but his flaming breath can destroy enemy units and buildings alike. He can only be attacked by ranged units, or by God Powers such as Zeus' Bolt. He cannot be healed. Nidhogg persists until killed and is under your control.

To summon Nidhogg, left click on the Nidhogg icon, then left click anywhere you have <link="topic:line of sight">line of sight</link>.