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Message: <blockquote data-quote="I'm A Banana" data-source="post: 6592436" data-attributes="member: 2067">The ultimate things about concentration in 5e is that it is a time-limiting mechanic and a stacking-limiting mechanic. Spells that are Concentration are designed with the idea that they will not last long (a combat, at most) and that there will not be multiple instances of them to increase.Your spell removes both limitations from Concentration, for basically your whole adventuring day.So ultimately, you've gotta ask yourself: are you cool with an invisible, flying mage raining down fireballs and magic missiles? Are you cool with a polymorphed elephant tramping into a group of people stupefied by hypnotic pattern?It's a big ramp-up in caster power to allow them to concentrate on two effects at once, and ESPECIALLY powerful if nothing other than the caster can end that concentration (honestly, the latter effect alone might be worth an 8th-level spell slot...).To balance it would require a MUCH shorter duration, and perhaps a decay effect, like roll a d20 every round and if you get a 9 or less, the spell ends for you. And even then it is going to let the caster dominate for the short time it is in effect. Power-gamers might build entire character concepts around this one spell. A high-level slot isn't in and of itself a balancing cost. It's still a 1/day effect, whenever a caster gets it. It simply is a rarely seen 1/day effect. You can make most casters sell their children to the mafia for access to a second concentration slot. This is cheap.</blockquote>

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