Ah, I meant as a Touch range, Concentration (or higher) duration. So you have the actual box safe at home in the Aegis, but you can still send "pull" boxes, that have an IT effect on them, wherever you need to. That only takes, what, 28 levels with maintains concentration?
You mean like The Master's Message (HP, p.81) in which you tag the "Sender" box before it is shipped out? Let me think about that...
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You could create new "Sender" boxes without a need for AC. So new box, touch it to the invested item, activate, and go. However see the section below.
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Concentration (with Maintains Concentration) would not be the best Duration. Firstly someone would have to be at the item every Sunrise and Sunset to keep the link up. To avoid that you would need to go with Constant, which is D: Sun, 2@day, +3 Environmental Trigger.
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Level would be 30 with Concentration (40, -15 for Touch, +5 MC) or 34 with Constant (40, -10 for Sun, +1 2@D, +3 ET). Since in most Saga you should be able to use Momentary not much of a savings. [Momentary effects can last a round, several published Momentary spells are designed to affect a spell cast the next round.]
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You would be stuck with a single AC link (see below) compared to the option of having multiple ones to choose from.
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If the link is somehow broken then a new "Sender" has to be sent by the Covenant to reestablish the network. So subject to failed upkeep (twice daily) with Concentration and the actions of hostile forces.
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It is an always up link that goes into the Covenant (or where ever you store your invested device). Granted they still have to penetrate your AotH but you can do some nasty low level stuff like set a fire. Sending out an always up and already established IT is a security concern.
While you could do it, I would not recommend it. Its only real advantage is a slightly lower total level if you do your enchanted item right, while having a few drawbacks.
You can get "Multiple Links" in a single enchanted item. There are a couple of ways to do this though they need to be decided upon during the design phase.
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Multiple fixed AC during construction: You could make them as something like individual signs on the item. Make the activation something like touch one and say a word. The one you touch is the AC used for the effects.
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AC Slot: Design the item so it has a slot in which an AC can be placed. This is a little more fiddly since you are dealing with multiple separate items. However you don't have to fix a bunch of AC at the time of creation. In fact you don't have to create any before the enchantment can begin. This also has the advantage of using non-fixed AC for at least the time they remain an AC.
You can find multiple examples in my Covenant's collection of Enchanted Items thread, not just for teleportation items but things "alarm bells", "communication devices", and "spy devices".
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Could you not have several IT originating from one item simultaneously? As long as you only make one new one each day, to not boost use requirements. Also, not sure if the constant would maintain the effect if it got out of range of the item, though I suppose the IT would provide the connection to maintain itself.
As for needing someone at the item, yes, but that can be a Grog, and you wouldn't need to fix ACs, if you had a rarely used box.
If you want several IT, then you would need several Effects. With just a single Effect that produces and maintains them it would have to drop the current one to create a new one. You could HR it but in that way lays madness.
With that HR, someone is going to enchant something with Unlimited uses per day that maintains concentration and just create hundreds/thousands/millions of its effect. Heck even with a single use per day you could end up with hundreds in a year. If just one of your players decides to exploit it then your game will rapidly spiral out of control. [If you really want to go with such a HR, I would recommend having multiple instances of "Maintain Concentration" and that is how many it could maintain at once.]
It is not just tying up a Grog for the twice daily maintenance. It is installing a possible link failure that can take a long time to recover from depending on the distance. The whole adding in IT just complicates the whole thing. The only reason to go with it is if you need to get required ReTe lab total down. It ends up costing you more total time, vis, and adding a second lab total requirement based on Vim.
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