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All Alchemy Effects

Fortify Illusion
Skyrim Potion Effect

Illusion spells are 22% stronger for 60 seconds.

Fortify Illusion is a beneficial alchemy effect in Skyrim, brewed into potions. It is carried by 8 ingredients, the strongest being Watcher's Eye. Its potion strength scales with the Alchemy skill and perks.

It is the effect behind 4 ready-made potions, foods and poisons.

Potion Strength

Brewed from its strongest ingredient row, without Fortify Alchemy gear. Every mixture containing that ingredient reaches these numbers.
AlchemistPotionValue
Alchemy 15, no perksIllusion spells are 22% stronger for 60 seconds.86
Alchemy 100, no perksIllusion spells are 30% stronger for 60 seconds.121
Alchemy 100 with Alchemist 5, Physician, Benefactor, and PoisonerIllusion spells are 75% stronger for 60 seconds.331

Potions and Food

Ingredients

Strongest first. When two ingredients in a mixture share this effect, the stronger one's numbers are used.
IngredientMagnitudeDuration
Watcher's Eye
cc
560s
Strongest
×1.25 magnitude
Dwarven Oil460s
Mora Tapinella460s
Scaly Pholiota460s
Taproot460s
Bliss Bug Thorax
cc
160s
×0.25 magnitude
Dragon's Tongue160s
×0.25 magnitude
Glassfish
cc
160s
×0.25 magnitude

Alchemy Calculator

Open the Alchemy Calculator with Fortify Illusion on the wishlist: it lists every ingredient pair that brews it, and computes the potion for your skill, perks, and gear.

Open the Alchemy Calculator