Exceptional bonus

Exceptional bonuses are very rare bonuses generally only found on high level loot. Exceptional bonuses stack with everything except effects with exactly the same name. Note that with Update 14, the developers updated most exceptional bonuses, and in most cases - changed them into the non-stacking Insight bonus instead. Very confusingly, some enchantments were not renamed (EG: Exceptional Fortification - but their actual bonus type was changed. These page lists all known exceptions to that change, assume all other exceptional bonuses are now Insight and do not expect more of these to be added in the future as the developers have stated they prefer to offer non stacking bonuses to create more confusing gear options.

Exceptional (Stat) Skills +1, +2 and +3
These bonuses exist for each and every stat, and effect all skills that use that stat as their modifier. They only appear on named loot, most notably - Green steel Accessories.

Example: An "Exceptional Charisma Skills +1" bonus stacks with an "Exceptional Charisma Skills +2", but not with another "Exceptional Charisma Skills +1" effect.

Previous Exceptional Bonuses
Previous to Update 14 there were also exceptional bonuses to Fortification, Sneak attack and Elemental Resistance. They were all changed to Insight bonuses except Elemental Resistance, which varied - the +5 was changed to competence, and the +10 versions were changed to insight.