From the look of that picture, it can hit it’s target 100-200 miles away in a direct trajectory ( no ark ) and hit fast.
Soooo... ~= 23 miles in six seconds.
No kidding it doesn't need explosives. Anything it hits will itself become an explosive.
I wouldn't want to be inside a mile or two of whatever gets hit with something traveling that speed. That projectile would blow a blacksmith's anvil to pebble sized fragments and launch them a mile in all directions, I bet.