The best replacement for hardened is heightened adrenaline rush.

The best alternatives to hardened are rated as following:
★★★★★  heightened adrenaline rush
★★★  prestige edition
★★  sleight of hand
★  warlord
★  veteran
★  blued
★  accustomed
★  water hardened
★  care package
  grade 8
  case hardened

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hardened
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