Transcendence is a keystone passive skill, obtainable only from Timeless Jewel. It was introduced from PoE 3.11
Armour applies to Fire, Cold and Lightning Damage taken from Hits instead of Physical Damage.
New Timeless Jewel Keystones in PoE Harvest League
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Each Timeless Jewel alters passive nodes within its radius based on its seed. The number on the mod is the seed that determines what the minor and notable passives will transform into, while the name determines which passive a Keystone in radius will transform in to. Using a Divine Orb will reroll the seed and name.
Each modified keystone can only affect you once — identical keystones do not stack.
You may only equip one unique Timeless Jewel at a time. (Each unique version has the tag “Limited to: 1 Historic”)