Kill the Queen of the Insect Horde and recover the Phoenix's Tear.
Crystals are strong foci for magical energy.
Their use in the manipulation of magic goes as far back as anyone can recall. Hokum, a powerful mage before the Backlash, used a massive ruby the size of a man's fist to power the magical barrier that protected the city for so many generations. The Phoenix's Tear, as it is known, is said to be the finest ruby ever seen in the kingdom. Apparently, during all their activity in the area, the Insectoids uncovered the Tear and now the Insect Queen has it in her lair. This gem would make the perfect power focus for our Juggernaut.