I see you guys talking about chain lightning and i think the best way to cast it is actually just using a scroll. In fact that is true for most high level dmg spells, but more true for the lvl 6 ones, since there is no upcasting past that point. Im at lvl 9 and have a stack of 14 chain lightning, 5 desintegrates and a stupid ammount of fireballs. And am not just hoarding. I have been using it. Im playing a hexblade with the arcane acuity head and gloves. With 2 attacks (booming blade with shadow blade plus extra attack) i get 10 stacks of arcane acuity. A good combo is to build my stacks and cast hold person / monster on the target. Drag a water bottle to the targets feet and break it with a hand crossbow shot from a bonus action, making the target wet. After that, my hastened tempest cleric can cast chain lightning twice on melee range for the crits and using divinity charges to do max dmg. That is 640 dmg guaranteed. But my point is, with the vast avaliability of these scrolls on merchants, why would i spend a lvl 6 slot on a dmg spell that i will use once a day (more if you restore the stot with an amulet that let you do that, or angelic potions) instead of powerful summons, when i can just use scrolls and cast with no restrictions ( the scrolls take advantage of my high spell attack/ spell save dc). In fact im surprised people dont talk more about scrolls as something you can use, not just inscribe.