The Crown of Hermes magical device (Covenants p.121) allows the wearer to have an imaginary lab within their mind to perform their magical investigations, limited to particular activities like studying arts and inventing spells. I’ve never seen this device used in a game but it is a very interesting option for a Magus who travels a lot or with strong Mentem Arts, as they can have a lab anywhere. When combined with the lab specialisation rules the lab might be on par with a standard lab for some activities.
A primary advantage is how portable it makes a lab. A Bonisagus Seeker might get a lot of use from it when they are frequently traveling, likewise a Mercere Magus, or a Magus who wishes to remain untethered. One of the primary downsides of the device is the warping it inflicts (even though it might be designed for the wearer).
So what if the enchantment was performed on a familiar bond instead a normal device, as the familiar bonds do not cause warping (as per Ars Magica p.168)?
Modifications would need to allow for casting upon the wizard, and perhaps also the familiar could share the experience, and preferably an effect which can be used more frequently if desired. It becomes an invested power of the bond as:
Imagined Laboratory of Hermes, Invested
CrMe/InMuRe 58, Base 35, +1 Touch, +1 Conc, +1 extra target. Then mods for +5 device maintains concentration, and +3 for 6 uses per day.
In this version the spell affects both the Magus and the familiar, allowing them to work together. It could also be made as (CrMe/InReMu 53) by only affecting the magus but being controlled by the familiar – which might make sense if the familiar was to guard the body of the Magus while the spell is in effect; although typically a magus wants that familiar in the lab to gain their skills. Those additional uses allow for interruption now that the effect duration is concentration. Continue reading