It is a reward for completing the quest Unfathomable Depths.
- With the 25% bonus, a fully-upgraded set of Dwarven Armor can give a slightly higher armor rating than fully-upgraded Ebony Armor, depending on the skill.confirmation needed
This section contains bugs related to Ancient Knowledge (Skyrim). Before adding a bug to this list, consider the following:
- armor bonus to all armor types except Dwarven armor. This can happen even after the official patch 126.96.36.199.8 that supposedly has the fix for the bug. Ancient Knowledge gives 25%
- Even though the effect's description says it only improves how fast Smithing can level up, it may improve how far armor and weapons can be upgraded instead.