There are 3 types of runes in this game that will restore some of your HP, MP or both.
Vampire rune = Restores HP when enemy is killed
Siphon rune = Restores MP when enemy is killed
Balance rune = Restores both HP and MP when enemy is killed
Balance rune seems nice, but I'd guess it restores less then other runes.
How much HP/MP do each of this runes restore? Is the amount they restore fixed or is it based on your level or max HP (of either you or the enemy)?