Optional Rule: Concentration Cantrips

One of the primary methods utilized by fifth edition to balance the power of spellcasting is concentration. Despite that, the rules for concentration have been quite contentious, as many players see them as too limiting to the flexibility of their spellcasting. This is especially true when considering how a minor ability such as a cantrip can prevent a spellcaster, regardless of class, from accessing far more useful and powerful magic. Cantrips are, after all, intended to be second nature to their spellcasters, so why put so powerful a limitation on such minor magic? The answer, of course, is to keep clerics from casting resistance on the entire party before every challenge in lieu of a bless or similar magic. The following solutions provide ways for game masters to alleviate some of the restrictions of concentration for their players while maintaining the balance of magic in their games

Concentration Cantrips Rules

To alleviate the frustration of cantrips interfering with higher-level spellcasting, the simplest solution is to separate cantrip concentration from concentration on leveled spells. With this rule, concentrating on a cantrip does not interfere with your ability to concentrate on a spell of level 1 or higher; the attention and energy required to sustain a cantrip is so minimal that it doesn’t interfere with higher-level spellcasting or vice versa.
However, you still can’t concentrate on more than one cantrip at a time. A 5th-level cleric could, under this rule, maintain concentration on guidance and spirit guardians, but if they cast guidance again, or a different concentration cantrip, the first guidance ends, as would spirit guardians if the cleric casts another concentration spell that requires a spell slot.