"10% increased effect of flasks"

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Natharias wrote:

Yes, it is all of them. For resistance potions, it increases the duration. You can compare these three nodes to the effect a Glassblower's Bauble would have on a potion.

This is incorrect.

These nodes are the equivalent of the Inner Force nodes, but for Flask Effects rather than buffs. They always increase the numerical effect of the flask effect, they have no effect on the duration.

Flask Effects include the primary over-time effect of drinking a flask, and any "while flask in effect" bonuses from flask mods.

For Life and Mana flasks, they have a base amount of life/mana to recover and a duration, which they use to calculate the strength of the flask effect, as a value of life/mana to recover per second. The passives will increase that value by the listed percentage, thus increasing the life/mana recovered per second, without affecting the duration - thus you'll gain life/mana faster for the same duration resulting in higher ottla life/mana gain.

For utility flasks like Granite flasks, it's a straight % increase to the value of the bonus given, in that case the additional armour.