Chapter 256: Fourth-level Territory, Nine Four-order (4K)_2

Mu Yuan purposefully let the patrolling soldiers on the front lines, let through a batch of monsters.

God Archers were operating the cannons, firing shot after shot. The shells burst out in dazzling sparks of thunder and flame upon impact.

Dust billowed up in the distance.

"Impressive power."

Lord Shepherd evaluated.

Regardless of the lethality or the range of damage, they were far superior to arrow towers. Of course, the arrow tower doesn't require an operator, doesn't need to replace ammunition, and can be upgraded.

The Thunder Flame Cannon couldn't do any of these things.

Their usage cost was also higher than that of the arrow towers, plus, they suffered from wear and tear.

After all, they were not a Miracle Building and thus required at least some science or metaphysical input.

Isloa glanced at the materials list, "The cost of constructing a Thunder Flame Cannon is about 10 to 12 soul crystals, the price fluctuates according to the principal materials."