The only known way to destroy one is to attack the magic runes used to summon it; doing so appears to cause Ambassador Darkness pain.
The objective of MagiQuest is to build and gain power by obtaining magic runes.
"His armor is bronze, thousands and thousands of years old, engraved with magic runes that ward him against harm," she whispered to Jeyne.
A tail of carved magic runes, individually too small for the unaided eye to discern, swirled out from a small carving in the center to the edge of the glass.
(That was usually the best magic rune to pronounce in America.)
The ultimate objective at the end of an episode is to recover a magic rune.
The book ends with Elan accidentally destroying the entire dungeon, including the gate, by activating another magic rune.
Her growing band of readers also knew that Jones's own novels easily transcended the routine stuff of rings and magic and ancient runes.
She then informed him of the location of a great sword engraved with snakes and magic runes.
In their new home, Jon boasted that his mother was able to walk on water by help of magic runes.