mellored
Legend
It's still a net buff.It makes them more fragile, though, losing 0.5 hp per level on average compared to the 1d10 standard. 2d6 results in too great of survivability compared to the other classes, and steps on Barbarians toes a bit. If the multi-dice thing is an imperative, the closest mathematically would be 1d6+1d4...but the asymmetry would cause confusion.
Losing -1 HP, but gain +Con in healing.
So slightly more fragile, but they can recover quicker.