Minotaur IV may be found in the upper half of the second section of the Yabbashah Block within Tartarus. It appears alone in battle, so it is represented by a smaller shadow crawling along the floor. Its Fear Boost skill makes it more likely that its Evil Smile will affect the party.
Minotaur IV may be found in the 3rd, 8th and 9th Paradise of Heaven within the Midnight Channel. It will alternate between magical and physical attacks. Despite not having set strengths and resistances, it will slightly reduce damage from Physical attacks and takes twice as much damage from Elemental spells. Defeating it may yield Heavy Chains. Selling 8 Heavy Chains will unlock the Oni-Gawara weapon for Kanji Tatsumi.
In Golden, it appears in Paradise 6 through 9 in Heaven. It may drop Sunstone for trade at Shiroku Pub.