The best replacement for relentless is red bull.

The best alternatives to relentless are rated as following:
★★★★★  red bull
★★★★  unrelenting
★★★  unrelentless
★★  wrathful
★★  tenacious
★  furious
★  chaotic
★  primal hunter
★  anarchic
★  superstition
★  unyielding
  twinkling
  ruthless
  dual fusion

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relentless
red bull
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