It depends, Hard melee hitters with multiple attacks and high AC + legendary Actions to Counter a botched save can go alone and wreak havoc especially at lower Levels.
For caster types i rather suggest a tactical battle Scenario, means Boss is not reachable without climbing or such, has some forcefield, uses a Simulacrum, at lower Levels uses Spirit Guardians etc. it is harder than a melee Boss but doable with a Little planning.
For caster types i rather suggest a tactical battle Scenario, means Boss is not reachable without climbing or such, has some forcefield, uses a Simulacrum, at lower Levels uses Spirit Guardians etc. it is harder than a melee Boss but doable with a Little planning.
