The woods around the covenant can be harvested for interesting herbs which provide about 15 pawns of vis a year, of various sorts
Under the covenant there is a spring which comes up from somewhere in the depths of the earth and leaves a residue of white crystals where it falls. These can be harvested for 10 pawns of vim vis a year. However the spring is in the middle of a labyrinth which constantly rearranges its self, and peridically sprouts big pointy knives
Near the covenant is an old battlefield, on which red flowers bloom only on the 22nd of April, at which point they may be harvested for Corpus Vis
In the hills to the west there is a spring which flows with tears and from which 4 pawns of perdo vis can be collected on the 15th of June
A nearby lake, the waters of which periodically reflect more than just the sky above, has rushes growing nearby which can be harvested for 4 pawns of Intellego vis a year.
Finally the mists of your nearest fairy wood are trapped in cobwebs and can be harvested for 6 pawns of Muto Vis a year.
In stock you have 100 pawns of Vis
5 Pawns of Perdo Vis (water from the spring)
10 Pawns of Corpus Vis (flowers from the battlefield)
2 Pawns of Corpus Vis (mandrake)
10 Pawns of Intellego Vis (rushes from the Lake)
10 Pawns of Muto Vis (bottled fae mists)
4 Pawns Creo Vis (early spring blooms)
2 Pawns Aquam Vis (King's Snowdrops)
3 Pawns Mentem Vis (Wild Rosemary)
4 Pawns Auram Vis (Storm Roses)
6 Pawns Animal Vis (Wolfsbane)
3 Pawns Rego Vis (White Laurel)
3 Pawns Imaginem Vis (Lost Violets)
4 Pawns Mentem Vis (Vainglory)
5 Pawns Ignem Vis (Dragon's Blood*)
5 Pawns Herbam Vis (mistletoe)
7 Pawns Vim Vis (Crystals from the spring, left over
from the past few aegises)
8 Pawns Terram Vis (Black Lichen)
5 Pawns Perdo Vis (Red Holly)
*You're not entirely sure if this viscous fluid is some kind of plant byproduct or actual dragon's blood