Absorb

Absorb is a damage prevention keyword ability, written as Absorb N, where N is a number. It prevents N damage from each single source that deals damage to the creature. Absorb was introduced in Future Sight. By its nature as a damage prevention ability, this is a white ability. It has only been printed on one card so far, the timeshifted Lymph Sliver.

From the ()

Reminder Text

The reminder text for Absorb on Lymph Sliver reads "If a source would deal damage to a Sliver, prevent 1 of that damage." Presumably, on a card that just had Absorb, "Sliver" would be replaced by "this creature" or something like that.