A laboratory is a fundamental tool for every Magus in Ars Magica. As such there are variations and rules in abundance for how to detail and personalise a lab (Covenants source book, p 106). Just to be slightly odd I thought detailing a few aspects of a floating lab might be interesting. Typically to find a structure for a lab isn’t difficult but finding something which is suitable as a portable and floating lab is harder, it’s either constructed purposefully by understanding mundane craftsman or conjured.
If constructed the sourcing becomes a challenge only in resolving how the building is designed for flight. The Magus comes to acquire the stonemasons, labourers, and materials of the build in context of their covenant resources.
If conjured the sourcing probably requires a bespoke spell for the shape and size required, so it adds seasons of work or vis to be spent if another Magus is supplying the solution. It does however grant the owner exacting design choices and options which would be very difficult for mundane craftsmen to complete.
Rather than a conjured room or tower which is then enchanted, I suggest taking a lead from the floating castle in Legends of Hermes (p.121), by using a massive sheet of stone as the base with a Rego Terram effect, say one pace thick by 30 paces across. That requires a constant lesser enchantment as ReTe28. This allows the stone sheet to move at the speed of a running horse. Then if it is commanded in the same way as The Flying Castle of Thomae then another constant lesser device of CrIg9 is needed to send the colored light as control commands.
A 30 pace wide disk is far more than large enough for a single lab and likely could hold a small tower, or many ancillary buildings too. The disk itself will have the same abilities and failings as listed for the flying castle. It’s plausible to have the disc far smaller than 30 x 1 paces to make a smaller block, especially if the next task is adding a multi-story building. It could be about 15 paces wide and still hold a huge lab, and reducing the blocks diameter makes it easier to fit into a lab for enchantment (note though the Ars rules allow for an outdoor lab, so it’s plausible to create a place to enchant this easily). Perhaps a block roughly 15×2 paces is better as it makes for an incredibly sturdy base.
In Ars Magica there is a tendency (for me at least) to try to create spell effects and items that are powerful and flexible. When doing this it tends to make the final artifacts expensive in terms of time and resources.
I was thinking about a second approach, which would exploit the rules for quasi-permanent effects which the Duration: Ring provides. Essentially Ring is a duration that lasts for as long as the ring is maintained. With that in mind here is a few sneaky effects.
The Persistent Torch
To start with get a craftsman to create a sturdy circular compartment, something solid which the grog can drop and not break, anything really as long as it has a lid that will cover the insides well. In the design you need to note a few aspects: a place for the ring to be either carved or attached on the inside, and a separate space for the item which is to be enchanted. In layman’s terms this could be a very small wooden box with a clasp which shutters the insides.
The craftsman insets the separate piece of some material that is inexpensive and easy to enchant in the middle of the box – I’d choose wood as it will be darn cheap. Avoid metals and stones as affecting them with magic is harder than wood, and there is no need to blow out the spell size.
Then the effect is simple – a Creo Ignem effect at level 10 to 15, with base effect level of either 3 or 4, +1 mag for Touch, +2 for Ring. It really depends on how powerful the light is meant to be. A base 3 light is a torch equivalent, and this seems useful for a grog wishing to travel without attracting too much attention – at as a level 10 effect could be spont’d easily.
A base 4 the light created is as bright as a cloudy day, which is more than enough, although spont’ing that level of effect will take some effort for some younger magi. Either way it is castable, and creates a portable light which can be given to grogs; or perhaps even given to mundanes as a gift. Light has a huge quality of life benefit, especially to the poor.
As alternates duration Ring can be used for these other purposes too:
Granting heat and warmth to devices which increases the comfort of an inhabitant. Perhaps a carpet or small bed could be cast upon after being inscribed with a ring. Creo Ignem again for the effect, approx level 2 base effect will see a final effect level 5.
Create a fireplace which never expires. CrIg around level 5 as a base, with 20 as the final effect – would make a great comfy fire to heat a room.
Create a simple magical compass, using a Rego effect combined with an Intellego effect so that the target always points north. Rego Terram 10 as the total effect. Base effect 2 for slightly unnatural movement, with +1 Intellego requisite, and +1 for Touch, +2 for Ring. Makes for a great gift.
A Magus could have many of the lights crafted by a mundane craftsman, and spont cast the rings on the surface of each. This could give an almost endless amount of light for a lab with no outlay of Vis, and very little maintenance.
Simple wards to protect against vermin, humans, or beasts. Rego with an appropriate form of a level around 10. There are special rules for wards which mean they are far easier to cast too, so don’t ignore them.
What do you get the pack-rat who has everything? A Pavise.
It is a very large shield used to protect bowmen; often during sieges. To me it looks more like a portable wall than a shield, but hey it obviously worked. Carrying your own cover is probably considered strange in regular rpg circles, and I’m not even sure what the stats for something like this would be in any game system. Parry, er no – its not moving. Cover from missile weapons? For sure.
In terms of size and load, they ranged from the size of other half height shields, which you would need to crouch to use, right up to full height barriers (basically doors). The real difference between a normal shield and a pavise seems to be the purpose built mount which allows the device to stand along without the user’s support, and be moved around slowly.
There are also a number of illustrations which indicate that they serve a number of other purposes, like having larger versions which infantry can also hide behind, or ultra-delux versions which small grates and doors built in to allow extra sniping options, and protection. It’s tempting to rework Leomund’s Tiny Hut into a Pavise effect.
Judging by the material easily found online they look to be taken to large battles and often decorated with ornate scenes. A basic pavise would be a section of wooden wall with a small foot stand (yup a wall). I could also see more advanced versions supporting a nice lazy curve, a shelf, perhaps a spine of some stronger material, and optional ways to get it around, like attaching wheels or lift bars. Heck add a few more splints of wood and the archery company is also carrying the dead around on readily available boards. Or just put a few bottles of booze on the inside and you’ve got a portable bar.
For stats, I’d say it should rule as cover as that is the clear purpose. If some archer is mad enough to pick the thing up and use it as a shield then make it like an ungainly tower shield – yes it gives cover but you’re not meant to pick it up as a proper shield. So +4 against other archers, and +0 against a swordsman who knows where to put the pointy end.