AbdulAlhazred
Legend
What about adding a new resource that you get only at milestones? Permanent foci and crafted items still need to cost money, but just "charge" one milestone per ritual for anything else that needs "control". The resource should be persistent (not lost at an Extended rest).
Just an idea.
Yeah. My experience is people aren't overly fond of "you have to have this chit to do X, Y, or Z" and it adds to book keeping. If something like that was going to be added to the game I'd feel better if it wasn't just tacked on to deal with one minor issue and nothing else.
[MENTION=95211]mudlock[/MENTION] I think something like "this ritual can only be cast during the full moon" is OK for some kind of story based DM designed plot ritual. I'm not sure I'd be enthused by the idea that the DM's permission has to be obtained every time you want to cast any old ritual. It makes rituals a DM resource instead of a player resource. Divinations of course do already tend to be effectively something like that already. I'd be fine with it as long as the DM is willing to go to the trouble to design the conditions ahead of time so that the player can plan on when it will be usable or not.