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Oath is the rune word 'ShaelPulMalLum' for swords, axes, or maces in Diablo II: Lord of Destruction.

Due to the indestructibility mod, Oath works well with ethereal weapons, and with a high roll its damage output can rival the best weapons in the game while having a fraction of the cost involved. It also features charges of Heart of Wolverine, which can significantly increase damage and attack rating for the player character and their minions or allies.

Defensively, it is one of the few rune words (along with Spirit) that offers magic absorb, which can significantly decrease the amount of damage done by hostile magic damage. This does not apply to general elemental damage or poison.

Result:
30% Chance To Cast Level 20 Bone Spirit On Striking
Indestructible
+50% Increased Attack Speed
+210-340% Enhanced Damage
+75% Damage To Demons
+100 To Attack Rating Against Demons
Prevent Monster Heal
+10 To Energy
+10-15 Magic Absorb
Level 16 Heart of Wolverine (20 Charges)
Level 17 Iron Golem (14 Charges)