Soul of Steel

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Soul of Steel is a notable passive skill that grants increased and flat armour rating. It also grants additional maximum elemental resistances.

Location

As of version 3.13.0, the passives cluster is located at Marauder area of the skill tree. The cluster shares the same Strength node with Bloodless cluster and Imbalanced Guard keystone.

Blight anointment to unlock the passive:

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Version	Changes
3.11.0	(Not in patch note) Cost to anoint Soul of Steel has changed.^[1] (A 3-way swaps between Crusader, Soul of Steel and Whispers of Doom) (Not in patch note) Removed the mod 5% additional Physical Damage Reduction from the notable.^[2]
3.8.0	Now able to allocate Soul of Steel via anointment^[3]
2.6.0	Soul of Steel is now cheaper to acquire. The two paths to it now differ, one is now combined. Increased Armour +% and Elemental Resistances.
1.3.0	Riddle of Steel renamed to Soul of Steel. Soul of Steel also grants elemental resistances and physical damage reduction. The Templar, Marauder, and Duelist starting areas have been reworked significantly.
0.11.0c	The Holy Resolve notable has been renamed to Riddle of Steel.
0.11.0	Notable passives with non-unique names have been renamed to their own names.
Unknown	Introduced to the game.

↑ Bex_GGG (June 18, 2020). "Anointing Enchantments Table in Path of Exile: Harvest". Path of Exile Official Forums. Retrieved June 18, 2020.
↑ Bex_GGG (June 17, 2020). "All Notables and Keystones in Path of Exile: Harvest". Path of Exile Official Forums. Retrieved June 18, 2020.
↑ Natalia_GGG (September 6, 2019). "Anointing Enchantments Table in Path of Exile: Blight". Path of Exile Official Forums. Retrieved September 18, 2019.