Go to the map with 3 Damage dealer 1 tank and 1 healer
First step 3 Damage dealers go to the Bloodfins and let the Damage dealers sunk, and they will come back with 10% HP and they are now shoot normal speed!
Second step at 20-25 mill let the tank sunk! Tank come back and it shoot bigger and faster!
Of course you need to use dragonfires bloodlust and you need vodoo cannon lvl2-3.
And your time will be in 2-3 minutes