Alter Potency

[The Bearer of Bad News]

Support Issue: Basic Rules
The Issue: Alter Potency
Rank: "B"
Skill: Supplementary
Effect: User can alter an Alchemical Item to increase its bonuses.
Special: ---
Drawback: ---
Description: User may alter bonuses (not penalties) of an alchemical item. This alchemical item must be contact, inhaled, absorption, injury, or ingested bases. User can increase an alchemical item's bonus. This bonus is based off of bonuses from Ability Categories. Any bonus that gives a +5 bonus in Ability Categories (Skills, Armour Points, Handseals, etc.) gains a +10 Bonus with Alter Potency. Any bonus that gives a +1 bonus in Ability Categories (Movements, Saves, etc.) gains a +2 Bonus with Alter Potency. Any bonus that gives an Ability Category bonus gains a +2 with Alter Potency. Making an Alter Potency Alchemical Item requires an additional x2 to Base Craft.
Limit: Must be an Alchemist. Must know Alchemy (100 Points)

I'm just unclear on if the bonus granted is in addition to or instead of the original value. Are things being improved by one grade or two?

For example say a plant gives you a +1 to will saves. With alter potency, does that become a +2 (replacing) or a +3 (adding)?

Incidentally, phrasing of effect may want to be modified to use "Ability Category" less often because while the intended meaning CAN be divined it is initially somewhat unclear.

And does it apply to values greater than 1/2/5, like the agility potion's +6 alchemical movements?
Link:

[Cadoc]

I'm just unclear on if the bonus granted is in addition to or instead of the original value. Are things being improved by one grade or two?

Its in addition to. If you have at least a +1 to Movements, Saves, etc. it will gain a further +2, likewise Skills, Armour Points, Handseals, etc. gain a further +10.

For example say a plant gives you a +1 to will saves. With alter potency, does that become a +2 (replacing) or a +3 (adding)?

Would become +3, The original +1, and gaining the further +2. Also for the sake of clarity if that herb only boosted will saves, you wouldn't also gain +2 to movements and the like.

Incidentally, phrasing of effect may want to be modified to use "Ability Category" less often because while the intended meaning CAN be divined it is initially somewhat unclear.

Yes Ability Category is the same as IMPACT-L

And does it apply to values greater than 1/2/5, like the agility potion's +6 alchemical movements?

Yeah the bonus works if you have at least +1/+5. A popular use of this is to apply it to stuff like gems of wisdom, or eternal potions.