In Ars Magica, no special feats are needed for a Magus to brew a potion, craft a talisman, or forge that magic item of great power.
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Lab Totals
For a Hermetic mage:
lab total = Int + Technique + Form +Knowledge (magic theory) + BLB
For those with Greater Herbalism:
lab total = Wis + Profession (herbalist) + Knowledge (folk magic) + BLB
| BLB | Base lab bonus from class level chart. |
| Technique, Form, Knowledge (magic theory), Profession (herbalist), Knowledge (folk magic) | Ranks in the appropriate skill. |
| Aura: Add the greater of any magical (or faerie, in the case of cunning-folk) aura present. |
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Vis: +10 for every pawn of vis used |
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Special Effects: if form is appropriate for effect (GM choice) |
Potions
(Potions may be made by Hermitic magi and cunning-folk)
Calculate potion level as with any other Hermetic spell. Convert spell level as usual (d20 level = ArM level × 2 + 3).
Other bonuses:
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Herbalism: Apply Herbalism bonus: poisons, +10; antidotes, +10; healing,+10; hallucinogens, +6 [This seems excessive, use a feat?] |
Results:
| One extra dose for every 10 points your lab total exceeds the effect level. |
Minor Potions
(Available to anyone with the feat Greater Herbalism.)
Example target skills:
| Animal Empathy – given to animal |
| Bonuses to Fort saves – to resist drugs and poisons |
| Concentration |
| Diplomacy – given to target |
| Faerie Sight |
| Handle Animal – given to animal |
| Heal – applied to victim; modifies healer's roll |
| Intuit Direction |
| Search |
| Second Sight |
| Sense Motive |
| Spot |
The DC is always 15. To make the roll, make a Profession (Herbalist) check (using a botchable d20 roll).
Results:
| If successful, add half (or subtract all) of the maker's Profession (Herbalist) ranks to (or from) the appropriate target skill or save. |
| Botches result in a Con drain (that automatically recovers in 24 hours) equal to the maker's Profession (Herbalist) ranks × 2. |
| Two potions taken to affect the same skill/roll result in a 6 Con drain (that automatically recovers in 24 hours). |
Banes and Charms
(Available to those with the Bane Maker and Charm Maker feats.)
Charms and Banes can be minor or major.
Add the appropriate modifiers:
| Increase a characteristic: + (3.5 × increase) |
| Increase a skill: + (1.5 × increase) |
| Add a feat effect: +14 |
| Longevity charm (for self): + (1.5 × modifier to aging rolls) |
| Longevity charm (for others): + (2.5 × modifier to aging rolls) |
| Cap a skill at its current level: +6 |
| Rolls in a single skill are always zero: +28 |
| Rolls in a single skill always fail critically: +42 |
| Reduce a characteristic: + (3.5 × decrease) |
| Remove the effect of a feat: +14 |
For a lesser charm divide the modifier by 2. Then apply the appropriate modifier for duration and number of uses:
| Duration | DC modifier |
| Day | +0 |
| Week | +2 |
| Month | +4 |
| Uses | DC modifier |
| One | -2 |
| Three | 0 |
| Continuous | +2 |
To craft the charm or bane, make a Craft (charm) roll (a botchable one) against a base DC of 25 with the following modifiers:
| ranks in Knowledge (folk magic) |
| character's BLB |
| ranks in Profession (herbalist) |
| Aura: Add the greater of any magical or faerie aura present. |