Diablo 4's Patch 1.4.2, released during Season 4: Loot Reborn, resolved a Masterworking bug specific to The Grandfather — a Mythic Unique two-handed sword and the highest item tier in the game, above standard Sacred and Ancestral Uniques. Masterworking itself was introduced in Season 4 as the primary high-end upgrade path: 12 tiers total, with tiers 4, 8, and 12 each applying a permanent 25% bonus to one random affix. If you are still hunting one, WowCarry lists Browse Mythic Unique item acquisition services for the current season.
The bug that Patch 1.4.2 targeted affected players who had already invested Pit materials into Masterworking their Grandfather.
The Grandfather carries a passive affix, "Ignores Durability Loss," which prevents the sword from degrading during combat. This affix has no combat stat value. The bug: it was incorrectly eligible to be treated as a regular affix by the upgrade systems:
Players with affected Grandfathers saw either a missing affix slot or an unexplained milestone result with no visible improvement to their combat stats.
| Affected System | Before Patch 1.4.2 | After Patch 1.4.2 |
|---|---|---|
| Greater Affix eligibility | Ignores Durability Loss could roll as a Greater Affix | Ignores Durability Loss is no longer eligible for Greater Affix rolls |
| Masterworking milestone bonus (tiers 4/8/12) | 25% bonus could apply to the durability affix | Bonus only upgrades combat-relevant affixes |
| Existing bugged items | Greater Affix or milestone consumed by durability affix | Re-rolled automatically on login |
Combat affixes on The Grandfather — Critical Strike Damage, Maximum Life, All Stats — receive Masterworking upgrades normally. The patch targets only the durability passive; Masterworking the sword in every other respect is unchanged. Players whose copies were affected saw them corrected the next time they logged in.
Last reviewed 2026-06-16 against Patch 1.4.2 Season 4: Loot Reborn — Maintained by WowCarry’s Diablo 4 team.
The Grandfather is a Mythic Unique two-handed sword — the highest item rarity tier in Diablo 4, above standard Uniques. It can only drop at Torment-tier difficulties and is one of the most coveted endgame weapons in the game.
Masterworking is an item upgrade system introduced in Season 4 at the Blacksmith. It runs across 12 tiers. At tiers 4, 8, and 12, one random affix on the item receives a permanent 25% bonus. The process costs Pit-run materials and scales in difficulty with each tier.
It prevents The Grandfather from losing durability during combat. The affix has no offensive or defensive stat value — it is a quality-of-life passive that means the sword never degrades and does not need to be repaired.
Yes. Blizzard's fix was retroactive. Any Grandfather where the "Ignores Durability Loss" affix had consumed a Greater Affix roll or a Masterworking milestone bonus was automatically re-rolled to correct the error when the player next logged in after Patch 1.4.2.
Yes. Masterworking on The Grandfather works normally after the patch. Only the "Ignores Durability Loss" affix was excluded from the upgrade pool. All combat affixes (Critical Strike Damage, Maximum Life, All Stats) continue to benefit from Masterworking tiers and milestone bonuses.
Patch 1.4.2 was released during Season 4: Loot Reborn, the season that also introduced both Masterworking and Tempering as the core item-upgrade systems in Diablo 4.
