To w through most of the history of D&D this was more of a cephalalgia for DMs if their group was at least uniform 5: Wizards had spells like Fly and Invisibility, and that made “persistent into the castle to open the abet door” boring instead of a take exception to. Because 5th edition cleverly solved the covered flying wizard problem!Various of the spells in 5th edition are now using concentration, a new concept. Flying, yes, invisibility, yes, but not both at the anyhow time. A prime example is the paladin, who has deeply few non-concentration spells, at least at condesc to mid-level. Thus the Rogue, who *can* be simultaneously furtive and climbing walls, isn’t put out of a job by the invisible flying Wizard any more.Having said that, for some classes the concentration concept is overused and ends up making their spellcasting damned weak. Spells like the equal 1 smites really shouldn’t be concentration, as they are already not profoundly powerful and concentration means they don’t job with more important spells like Hallow or Compelled Duel. But I think it is currently applied to too scads spells and could be better balanced.Tobold’s Blog The gates are locked, there are guards on the battlements. For the Warlock the deed data that Hex is a concentration spell and the exceedingly staple of his existence, makes any other concentration watch nearly useless.So, yes, concentration is a gainful new concept. So why would I put it in one of my adventures? Not only does that mean that if you are hit by an arrow, you include to do a concentration check or fall to the footing; it also means that you can merely concentrate on one spell at once.