TwoSix
Dirty, realism-hating munchkin powergamer
Then it'd be called Fireball.
Again, I provide a perfectly valid 2nd level spell that does a similar amount of damage for two-turns of investment for comparison.
As for being a pillar and a sphere... the pillar is a descending one, followed by an explosion. Although I could of worded it better.
I do like the spell, but I think the decreased radius of Moonbeam means that it's overall damage per time should be higher compared to Crimson Flame. 3d12 feels better to me, personally. I'm fine with the scaling, Damage over time spells should scale better than instantaneous ones, and the fact that it consumes concentration means it will never be a true replacement for fireball.