If not for the high values wanted/needed, I'd say that they'd be better picked as Alchemical spells, so that they can be prepped ahead of time (but at heavy drain in this case), and don't need to be sustained (they last Potency in minutes, IIRC).<br/><br/>To use Magellan as an example, an Increase WILL preparation would need to be at least force 3, have drain 2 (F-1), and would roll (remaining net hits on the Alch+Mag v Force roll) + Force to see how much it would increase. For the group's mages, they probably don't want to go above Force 4 unless they're feeling lucky. But assuming they went for force 5 and got a bit lucky, they could have Potency 3 (3 net hits on Alch+Mag v Force) and it'd roll 8 dice. So it'd give an average of 2 hits, last 3 min, and they'd have to deal with 4 drain. Reagents could improve this but not a lot, unless they got spirit aid and were willing to risk the drain becoming physical.<br/><br/>And, of course, I don't recall either of them being very skilled in Alchemy.