[Baalz]

See, that's exactly the problem most people have with communions it seems, they want (for instance) the guy who got the air random to cast thunderstrike, while the other big mages are casting all kinds of stuff the slaves don't have the paths for. That's the kamikaze way to use a communion, and while effective *will* result in communion slave deaths because the slaves are soaking up fatigue for spells they can't themselves cast (alternatively you can use 16+ slaves so they can actually soak that stuff up). That is, of course, a viable strategy but you should be aware of the cost and not bemoan it. The other way to use a communion is as I describe above, which is much safer and still hideously effective most of the time.

If your question is how to prevent master from overdraining slaves to death, the answer is don't make the master more powerful than the slave. If you objection is then that you don't get to supercharge your mage to cast spells not otherwise possible, I say just use more slaves (use 16 slaves and one master...you can cast thunderstrike all day long). If you think that's too expensive, then just go in knowing your slaves are expendable kamakazees and plan accordingly.