The Redeemer is one of two unique Mighty Scepters from Diablo II.
As its name implies, the Redeemer gives a large boost to Redemption, a fairly useful ability for Paladins with ineffective Prayer or Meditation auras. Like its sister unique Mighty Scepter, Heaven's Light, the Redeemer is most effective against Demons, but due to its bonus to Holy Bolt, it is also effective against Undead. The Redeemer is one of the most powerful scepters in terms of physical damage.
On a side note, the Redeemer also cuts requirements by a very large amount, meaning that compared to other high level items, it has lower Strength and Dexterity requirements.
Stats[]

The Redeemer
Mighty Scepter
One-Hand Damage: (140-160) To (182-208)
Required Level: 72
Required Strength: 50
Required Dexterity: 26
Durability: 50
Mace Class - Fast Attack Speed
+250-300% Enhanced Damage
Damage +60-120
+50% Damage to Undead
+200-250% Damage To Demons
+2 To Paladin Skill Levels
-33% Target Defense
+2-4 To Redemption (Paladin Only)
+2-4 To Holy Bolt (Paladin Only)
+3 To Light Radius
Requirements -60%
(Only Spawns In Patch 1.10 or later)
Normal Scepters — Knell Striker (Scepter) • Rusthandle (Grand Scepter) • Stormeye (War Scepter)
Exceptional Scepters — Zakarum's Hand (Rune Scepter) • The Fetid Sprinkler (Holy Water Sprinkler) • Hand of Blessed Light (Divine Scepter)
Elite Scepters — Heaven's Light (Mighty Scepter) • The Redeemer (Mighty Scepter) • Astreon's Iron Ward (Caduceus)