Concentration for Martials

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Taking this thread on a related tangent, I am less concerned about the "Concentration space" than the "Reaction space".

This is probably me just being in the honeymoon period of design, but I've been loving rest-gated reactions for martials, particularly defenses. Forcing re-rolls of enemy attacks, getting a free re-roll on a save or an outright use of Legendary Resistance, triggered attacks for movement through a sizeable zone.

That said, if 4e taught us anything, it's that reactions slow the game down a ton when everyone has them. I think maximizing your use of reactions should be a core element of high-optimization play and ideally all classes get some, but they need to be opt-in the way spells are.