@Silen: Are the boss challenge maps randomly generated? If so, it seems like I keep getting into a situation where I cannot take damage form a combo of gaps/obstacles/mobs/the boss. Also killed the boss in Boss 1 challenge twice, but both times lost because I dies 1 second afterwards.
@doctor: there's heal affinity which gives a chance to heal for 3 matched gems, and heal mastery which increases how much you heal for 4/5
matched gems. Think nothing like you described.
Think the damage is % increase. Your base is too small to gain anything w/ a 5% increase. Know it's applies to weapons.