It's referenced part 1 of this Q&A, and in the L&L that introduced the legacy system. Though, from the way this Q&A talks about legacy, it seems like each piece is a separate optional rule. So maybe spell research won't be restricted to the "legacy tier."We're did they say that spell research is only part of the legacy system?
Warder
I mean, if the Ranger has a feature that says you can never get lost in the wilderness, that still makes sense if you're not using the exploration rules. But if the Rogue has a feature that says you can get an extra downtime action as long as you use it for socializing, then that isn't going to mean anything for groups that don't use the downtime system.