Reading the Whole Spell, Not Just the Damage Line
Most players learn a spell by its damage dice and nothing else. They memorize the big number, slot it into a turn, and move on. This is how perfectly good spells get a reputation for being weak, and how perfectly situational spells get cast at the wrong moment. The use case is the part of the entry that tells you when a spell earns its slot. It lives in the range line, the duration line, and the save it forces. Ignore those and you are playing half the spell.
Consider duration first. Hex is a 1st-level enchantment with a 90-foot range that adds 1d6 necrotic damage to every attack against the cursed target, and it requires concentration. Players treat it as a single-fight buff and then lose it on the first hit they take, because they cast it with no plan to protect concentration. What they miss is the upcast. At 5th level or higher, Hex lasts up to 24 hours. That turns it from a combat opener into something you set before a dungeon and carry across multiple encounters, assuming you can keep concentration intact.
Private Sanctum hides a similar scaling detail. It creates a magically secure area for 24 hours, starting as a 100-foot Cube. The part people overlook is that each spell slot level above 4 adds another 100 feet to that Cube. Cast at a higher level, it secures a genuinely large environment, which matters when you are controlling movement or sightlines during a defense or a long rest in hostile territory. The duration was never the limiting factor. The size was, and you control it.
Then there are the spells whose use case is a warning rather than a bonus. Inflict Wounds reads like a monster: 2d10 necrotic damage at 1st level. The catch is the range, which is touch, meaning zero feet. You have to be in melee to land it, and it targets Constitution, the save bruisers are best at. Thrown at a high-Constitution enemy, it fizzles after you walked into danger to deliver it. Aimed at a low-Constitution target you can actually reach, it moves the fight.
Scorching Ray fails the same way for a different reason. It is three separate ranged spell attacks, each for 2d6 fire damage. Against a single target with no advantage, the odds of whiffing one or more rays climb fast, and the spell feels flat. Its use case is multiple enemies to spread the rays across, or a guaranteed advantage situation such as a restrained target, where all three are likely to connect. Cast it into a low-hit-chance scenario and you have wasted a strong slot.
Find Traps rounds this out by showing that a spell’s value is not always damage at all. It is a 2nd-level divination with a 120-foot range and an instantaneous duration that reveals any trap within line of sight, including the objects and mechanisms built to harm you. Players cast it only to avoid taking damage and then forget about it. The better read treats the information as tactical. Knowing where the traps are lets you reposition, funnel enemies, or change which objective you chase first.
The thread across all five is that the damage line is the least interesting number in the entry. Hex and Private Sanctum reward upcasting for duration and size. Inflict Wounds and Scorching Ray punish you for ignoring the save and the attack math. Find Traps pays out in knowledge, not hit points. The book already told you how to use each one. You just have to read the lines nobody reads.
Running it: Before you prepare any spell, write down its range, duration, and the save or attack it uses, then decide the exact table situation where those three things pay off.