Draining shield

If you would take any damage by magic and or physical attack you would gain life equal to the damage dealt . upon casting again its effect will reduce by 1d4 X the times used consequently .

not using this spell once per full round will have 1d4 replenish.

example.  on turn 1 will heal fully if cast once more on next turn subtract 1d4 

if not casted remove 1d4.

max de-buff cannot exceed 75% of damage.