The best replacement for ballista is catapult.

The best alternatives to ballista are rated as following:
★★★★★  catapult
★★★★★  dsr
★★★★★  trebuchet
★★★★  dsr 50
★★★★  npc
★★★  dsr black ops 2
★★  dsr for quickscoping
★★  xpr
★★  dsr quickscoping
★★  onager
★★  archer towers
★  xpr 50
★  msr
★  npc evony
★  arrow barrage
★  valleys
★  scorpion rome 2
★  xpr-50
★  lvl 10 npc
★  archers
  onager rome 2
  ballista
  trapper
  mrad
  npc lvl 5
  barrett mrad

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Google Trends

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ballista
catapult
dsr