Add a “classical mechanic” monster as a counterpart to the quantum mechanic. It has a unique attack strategy; if it’s not in melee, it will rush towards you all at once and send you flying when it collides. This is an elastic collision that conserves momentum, so how far you are sent flying depends on how far it traveled to reach you and your relative masses.

If it is in melee range, it has a melee attack that drains your magic energy to make itself stronger, but if you subsequently kill it and eat its corpse, you regain exactly as much energy as you lost (conservation of energy). They also mutually grudge quantum mechanics.