Messerschmidt's Reaver - Unique - Diablo IV Season 15
Messerschmidt's Reaver is a Unique Two-Handed Axe (Two-Handed Slashing) in Diablo IV Season 15 for Barbarian, Druid, Necromancer, Paladin, Warlock. It comes from Season 15 Legacy Unique; Horadric Cube: Item Transmutation - Upgrade to Unique from a Common base of the same type; All Unique items can drop at level 1 in any Difficulty since 3.2.1 (official patch notes).
Unique power
Lucky Hit: Attacks have up to a [40 - 60]% chance to explode, dealing Fire Damage and reducing your Cooldowns by 1 second.
Affixes
+Weapon Damage (guaranteed affix per one guide)
+Life On Hit (guaranteed affix) ([789 - 948] (one guide) / [1,578 - 1,896] (another guide))
Where it drops
Season 15 Legacy Unique
Horadric Cube: Item Transmutation - Upgrade to Unique from a Common base of the same type
All Unique items can drop at level 1 in any Difficulty since 3.2.1 (official patch notes)
General Unique loot pool / world drop - not attached to any boss loot table (one guide, another guide and a third guide)
Nightmare Dungeons, Helltide Chests, World Bosses, Kurast Undercity, Purveyor of Curiosities (Murmuring Obols) (one guide)
Uber/Lair boss ladders and Tormented bosses, Helltide chests, Whisper caches (one guide and another guide - low authority, unverified)
Season 15 Legacy Unique: world drop; craftable as Charm (except Leoric's Crown/Messerschmidt's per one guide); exact boss/activity source not documented
Season 15 Legacy Unique: drops from the general unique pool (any Lair Boss hoard / Torment world drops) on Seasonal and Eternal realms - permanent addition, not season-locked (Blizzard S15 article, one guide news)