Upgrade to Mythic (random, Season 14 legacy recipe) - Horadric Cube recipe - Diablo IV Season 15
The Upgrade to Mythic (random, Season 14 legacy recipe) recipe in the Diablo IV Horadric Cube takes 1x Unique item, Item Power 850+, occupying the target Mythic's slot + 4x Pandemonium Fragment and produces random Mythic item of that slot.
Inputs
1x Unique item, Item Power 850+, occupying the target Mythic's slot - IP 850+; character level 70; Torment I+
4x Pandemonium Fragment - was 5 at S14 launch, reduced to 4 after patch 3.1.1
Output
random Mythic item of that slot - Always Ancestral, +30% Unique Power value, other affixes maxed. Does NOT retain the input item's own affixes.
Restrictions
Character level 70
Torment I or higher
upgradeVisibleseasonal
CONFIRMED RETIRED/REMOVED in Season 15 per one guide ('Corrupted Reaper fragments and Pandemonium fragments have been removed from the game') and a games-news outlet ('Season 15 will remove Mythic reroll crafting from the Horadric Cube... adding a direct upgrade instead'). Kept for historical reference / comparison against the new S15 upgrade_direct_to_mythic recipe.