/give @p simple_trophies:trophy 1 0 {
  TrophyItem:{id:"contenttweaker:kajaros_rib",Count:1b,Damage:0s},
  TrophyName:"kajaros Slayer",
  TrophyColorRed:0,
  TrophyColorGreen:0,
  TrophyColorBlue:0,
  TrophyVariant:"classic"
}