Son of the Serpent
Pupil
Comparing to fire ball and considering what MM's role traditionally has been and what fire ball's traditional role has been i honestly dont think this is at all broken. Also it only outruns fireball's dps when you consider the two are being used against enemy parties and not an individual (this is reasonable) at 9th level. Not a level sooner. This assumes enemy party average size is approximately 4. Again. Reasonable. This is also the default fireball assuming saves are made exactly half the time. Most likely enemy saves will fail slightly more often than they win though because its dex against caster's primary stat. If we assume evocation mage or sorceror (with metamagic voodoo) then it never catches up. Further, the wizard can do this a max of 4 times a day before needing a long rest. That fireball is gonna be wayyyyyy stronger an option considering all this, but not for loremaster. Becausenow the 2d10 doesnt multiply by die count.