You absorb three quarters of all damage dealt to you by one source. You may use the absorbed damage in two ways, DISSPELL or GAIN

DISSPELL: Use the damage absorbed in your next attack, adding it to our attack damage

GAIN: Gain half of the damage absorbed to your HP total

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the extra damage increases by 1d6 for each slot level above 1st.