The Underworld Dragon is the guardian of precious metals and jewels buried deep beneath the earth. Legend states that volcanoes are created when these dragons burst out of the ground to reach for the heavens. The pearl is said to multiply whatever it touches and contains the dragon's immense wisdom, hence also known as the Pearl of Knowledge.
Land 3, 4, or 5 pearl scatters to trigger the Bonus Blast Reel feature. Watch the dragon unleash fury as he expands the reel sets and award players with giant symbols. Land 4 or 5 scatters to expand the reels into 3 sets and win 5 or 10 Free Spins. When only 3 or 4 scatters land in the base game, re-spins occur to give players a chance to hit 4 or 5 scatters.