Enlarge / Reduce

30' | 1 creature | V / S / M (powdered iron)
{p/c} Concentration: 1 minute
CON save or become shrunk: lose 1 size
category, disadvantage on STR checks & saves,
and subtract 1d4 from damage
Or grow: gain 1 size category, advantage
on STR checks & saves, add 1d4 to damage