The best replacement for mace is pepper spray.

The best alternatives to mace are rated as following:
★★★★★  pepper spray
★★★  nutmeg
★★  flail
★★  sword
★★  sidious
★  taser
★  morning star
★  sabre
★  morningstar
★  palpatine
★  stun gun
★  sword skyrim
★  maul
  mase
  pepper
  yoda
  dooku
  war axe skyrim
  anakin
  flail dragon nest
  tear gas
  heide knight sword
  axe
  bear spray
  warhammer
  sword mystic knight
  reinforced club
  allspice
  sword rogue
  sabre pepper spray
  wagnhak
  emperor

Your alternative for mace is not listed? Suggest!
Speaking about mace, one probably shouldn't forget about flashlight.

Other search terms related to mace and their ratings are:
★★★★★ flashlight
fire and sword
You have in mind a companion for mace and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of mace in all years. Click on graph for more.
mace
pepper spray
nutmeg