cbwjm
Legend
This sort of experience - getting surprised by a spell's effect I've chosen to use - is why I've shifted away from using spells from the book when DMing. Instead, I will make up similar, simpler versions that don't follow the standard rules. For example, a goblin shaman in my game would be listed as:
Just like a goblin, with the following spells:
Inflict - melee attack +4, 2d6 necrotic damage. Can be empowered once to attack 3 times (separate targets)
Spirit shield - as a reaction, grants +5 AC to ally for 1 attack (recharge 4-6)
Spirit warg (concentration) - appears for 1d4 rounds, bites someone each round (+4 melee, 1d8+2 piercing)
Of course, this doesn't work when using an adventure as written. I miss 4e's monsters.
I tend to do something similar to this but with actual spells, makes it easier to run without flipping through the book if you are unsure of what a spell does. A goblin shaman with 1st level casting ability might look like the following:
Sacred Flame, 60 feet, Dexterity [12], 1d8 radiant/0
OO Inflict Wounds, +4 melee, 3d10 necrotic
I only found out how much damage inflict wounds deals the other day when I was flicking through the spell descriptions, I've never used it before so hadn't considered that it could be so damaging.