Magical Removalist (Ritual Tunnel version)
ReTe 20 - Ritual
R: Touch, D: Mom, T: Ind
Teleports touch structure to a location that has been prepared for it. The structure can be as big as that which is created via the common ritual of The Conjuring of the Mystic Tower. Uber of Jerbiton used this to bring accommodations to tribunals and then bring it back home via an intangible tunnel which also has to be a ritual.
(Base 4: Teleport non-living objects 5 paces (casting requisites are required), +0 Distance increase 5/50/500/1/7/AC, +1 Touch, +4 Size, -1 Set Location) Based on “Portage of the Eagle” TME p.109. Rego Terram Level 4: Transport a non-living object instantly up to 5 paces. For objects larger than something that can be comfortably held in two hands, size modifiers are necessary. Casting requisites may be needed if the item is primarily not under the Form of Terram. TME p.107
The Set location refers to a location that has been prepared to receive the foundation of the moved structure. I'd require something like a months work of a crew with an architect.
I'm fuzzy on the tunnel piece because of the Touch/Touch range....
Here is the version w/o the tunnel intent:
Magical Removalist
ReTe 45 - Ritual
R: Touch, D: Mom, T: Ind
Teleports touch structure to a location that has been prepared for it. The structure can be as big as that which is created via the common ritual of The Conjuring of the Mystic Tower. Uber of Jerbiton used this to bring accommodations to tribunals and then bring it back home.
(Base 4: Teleport non-living objects 5 paces (casting requisites are required), +5 Distance increase 5/50/500/1/7/AC, +1 Touch, +4 Size, -1 Set Location) Based on “Portage of the Eagle” TME p.109. Rego Terram Level 4: Transport a non-living object instantly up to 5 paces. For objects larger than something that can be comfortably held in two hands, size modifiers are necessary. Casting requisites may be needed if the item is primarily not under the Form of Terram. TME p.107
So, first, I don't believe you can use an intangible tunnel to stage a "teleport at touch" kind of effect. Intangible Tunnel lets you throw spells through the tunnel to affect a target at a distance, and for a teleport spell, the target you're opening the Tunnel to isn't the target you're trying to teleport, so it's useless. You could, of course, use that to teleport the target at the AC... but you'd still need the range from that location.
With a 9th or 10th magnitude effect, ritual isn't necessary unless your troupe decides it does in this specific case. I wouldn't allow the -1 magnitude. Yes, if you want to move a Mystic Tower, you need to find a way to prepare space for the basement to land in. This is your problem to deal with - if you don't prepare the land, you're going to wreck your basement, or you need magnitudes to compensate somehow. Preparing the effect so it's possible doesn't entitle you to reducing a magnitude. I might allow a spell with -1 magnitude if, for example, it was keyed to only teleport to one spot at arcane connection, but arguably that's not a standard parameter, and I could require experimentation on that. But it doesn't seem to be quite what you intended.
I would also use T:Str (+3) instead of T: Ind +4 size increase.
"Structure allows to target a structure and its content.
The spell affects everything
within a single structure. The structure itself
counts as within the structure for these purposes,
as the limit is the outer edge of any walls.
The structure can range in size from a hut to a
castle keep, but it must be a single, linked edifice."
Whereas Ind, even with several size increases, will only target the selected item, not its content.
Considering that Structure allows you to affect up to a castle keep, it should be enough. It will save you one magnitude from Ind +4 size increases.
I also agree on all the comments of @temprobe regarding Intangible tunnel and the generous -1 for set location. Any TP spell requires also a Finesse roll.
You're right that target Structure is better as it includes the contents, however, it's likely that a mystic tower is a structure size +1 and no magnitudes are shaved in the end. A structure is ten base rooms - four hundred square feet each. Mystic Tower has more than that. Even if it is a very under-optimized +4 size spell.
Anything from 7% to 11% over Size +3, depending on how you calculate it out. Doing something as simple as shaving the outer walls from 12" to 10" thick and trimming excess stone usage would easily allow it to be Size +3. [Yes to Structure. Possible still need +1 Size, would have to do math and haven't had coffee yet.]
For a reduction in Mags to be acceptable, it has to be specifically listed for that TeFo effect. For these it is not actually a reduction but saying the restricted effect has a lower Base, the same things that have a higher Base are listed as a positive modifier (affecting things with MuTe have a Base 2 higher if it is metal). It is a way that allows them to list a whole bunch of effects with a variety of Base in less space.
The -1 Set Location is not valid.
While using Touch through a tunnel is valid, the distance teleported is determined by the Base and has no relation to the Range of the spell. If you have a tunnel to something, you can cast a touch range teleport on it but it will only teleport a maximum of the Base. The tunnel can not 'be teleported through'.
Has a powerful effect feel. I'd argue that the formulaic version would be prone to damage the structure and require a high finesse roll to "land" the structure soundly.
Inspired by the spell CrCo "Restoration of The Missing Limb". I'm ok with effects that are somehow restricted in their use in order to reduce the level of effect a bit.
I would also be happy with that but the ReTe guideline to teleport material is specifically Target Ind with size increases tied to a logic of how many men it takes to lift the thing. Not sure we can convert to using Structure.
Not all. Leap of home coming does not because of the familiarity of the destination. Going for the same benefit.
Adding to the inquiries, how would a MuTe Size reduction effect impact the teleportation effect? Could we effectively make the Tower small enough to only require say a +2 size modifier?
Sure! But that's two spells rather than one. If you want to go the MuTe route, you might instead turn the tower into something much more easily moved. E.g., turn it into a stormcloud: a thunderhead is quite fitting for a tower!
Cast at D:Conc and Maintain the Demanding spell to save magnitudes on your RItual (and allow you to control when the spell ends). And/or cast as T:Circle rather than as Ind+4 or Struc+1 to shave 4 magnitudes in exchange for a little extra risk. With both options (and assuming it's not a Ritual) the spell level is then MuTe(Au) Level 10, low enough that it can be cast spontaneously:
Base 3 (turn dirt to a liquid or gas) +1 (start with stone) +1 Touch +1 Conc +0 Circle
A 4th magnitude Maintain the Demanding Spell of D:Moon (which every efficient magus should know!) can keep the transformation up long enough to transport e.g. via summoned winds the cloud-tower between any two spots in Mythic Europe.
Quite clever. Bit paradigm shifting where Magi can easily steal towers with a level 10 effect. Not sure it fits the established Ars paradigm.... I mean, if this happens a few times where the castle, manor, church, etc just disappears overnight into the mist, folks would be talking about it and fearing it. If it was a level 40 ritual, then I'd say no problem there but a level 10 spont!
I think I would seek troupe consent to make it a ritual if the target is bigger than say a one room house under the "powerful effect" umbrella but it would be a new low level effect to qualify for powerful effect.
I really like turning it into a thunderhead specifically for the cosmetic effect that when you dispel it/when the spell ends, it can start to rain, and where the rain falls the castle forms, drop by drop, which is just very cool.
That's why the clause "if it looks too impressive, make it a Ritual" exists; I'd expect many (most?) troupes to go that path. On the other hand, one could argue that the reason why magi don't go stealing towers all over the countryside is social: the Oath prohibits interference with mundanes.
Note that, by the ArM5 rules/guibdelines, a (specialized) apprentice can easily destroy a castle within Sight over a few minutes with fatigueless spontaneous magic by bombarding it with Level 4, CrTe, one-thousand-ton blocks of clay. Being able to steal a tower with 2nd magnitude MuTe(Au) effect (and one that requires the caster to draw a largish Circle, manage Concentration etc.!) appears reasonably in line to me!
Stealing large structures from fellow magi will certainly draw a lot of negative attention from the quaesitors. But stealing famous libraries from outside any tribunal? Well done, sodales, well done.
This practice will definitely benefit from integrating “ritual items” from the folk witches. Not solely to assign the task to an expendable grog—admit it, you considered it—but to reduce time. You might get away with hours of chanting and making odd gestures for several uninterrupted hours, but pouring out a pint of glowing liquid? You’ll be home with your new acquisition in minutes. And Merv will lose its best library just before the Mongols burn the whole city anyway.