Benjamin Olson
Hero
Good rule in general but Cloud of Daggers... has no save.I generally do not require a "snap to grid" for effects, using a template to determine where the effect occurs. If a character is not in at least 50% of the space, it has advantage on the save for being on the edge of the effect. This means that Cloud of Daggers could affect multiple creatures, but they're all going to have advantage on the save.
I would prefer they dispensed with square effects entirely. They are just unnecessarily gamey.Maybe a sphere would be a better format for this spell, like all other ''cloud'' spells.