Karkadann (Persian) – While not evil, these are the bullies of the deserts and they think of themselves the rightful Lords of the Deserts. These agressive desert Unicorn are much bigger than their weaker cousins and are truly fearless, they attack creatures much bigger than themselves such as dragons without a chill.
Nidhogg (Dragon)(Huge) – Both plant and dragon, these creatures of the deep underground look like black dragons with roots growing out of their entire bodies. They burrow through the earth at surprising speed, feeding on roots and creatures alike. Not often a Nidhogg burrows its way to the world of light, but when it does no creature is safe from its horrid breath-weapon that spreads seeds into the victims’ body, which will hatch into crushing roots. (Norse)
Pandora's Box-- The "box" was actually a large jar given to Pandora which contained all the evils of the world. When Pandora opened the jar, all its contents except for one item were released into the world. The one remaining item was Hope. Today, to open Pandora's box means to create evil that cannot be undone.