Asisreo
Patron Badass
Yes, precisely. I still hold to that.Earlier on, you said that for that reason, you shouldn’t send solo monsters against the party.
Not necessarily. Multiple monsters can be AoE'd but multiple monsters can also just threaten the concentration of the caster that is concentrating.Of course, encounters involving multiple monsters tend to favor casters.
The Purple Worm example would hardly work if there was a second or third monster that attacked your character afterwards, especially if it does as little as 22 damage in their attack.
However, the Mummy Lord can get OTK'd by a fighter almost completely regardless of any secondary monster.
And that's just the benefit of single-target damage. If you can kill a monster, permanently, you've completely taken them out of the fight without worrying about concentration or having less buffs. If you just banish/polymorph/Hypnotic Pattern the monsters, their allies can simply threaten your concentration and nothing really changed.
Wizards and fighters can work together on this, but that just means they each can contribute in the fight.