The best replacement for behemoth is leviathan.

The best alternatives to behemoth are rated as following:
★★★★★  leviathan
★★★  emilia
★★★  mega tank
★★★  leviathan wonderland
★★★  deicide
★★★  nile
★★  deathclaw
★★  chocobo
★★  cannibal corpse
★★  bahamut
★★  dimmu borgir
★  tonberry
★  goliath
★  svarog
★  belphegor
★  kogarasumaru
★  gorgoroth
★  behemoth
★  chichu
★  berserker little empire
  narasimha
  drop zone
  morbid angel

Your alternative for behemoth is not listed? Suggest!
Speaking about behemoth, one probably shouldn't forget about spell of inferno.

Other search terms related to behemoth and their ratings are:
★★★★★ spell of inferno
You have in mind a companion for behemoth and it is not yet here? Propose!



Google Trends

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behemoth
leviathan
emilia