The biggest mistake I made with the Cleric I play in my current session is that I do have Guiding Bolt, a 1st level spell dealing 4d6 radiant damage with a spell attack, but not Word of Radiance, which deals 1d6 radiant damage against anyone whom I want to cast it on as a cantrip, or Sacred Flame, which does 1d8 radiant against a specific target, also as a cantrip. I'm pretty much going into my upcoming boss fight against a (presumed) vampire going "I want y'all to pin down and/or restrain the fucker, 'cause I get only one shot at this and I want to make it count."