Full Counter enables its user to reflect attacks aimed at him back at the enemy, but with more than double the power; therefore, the stronger the opponent's powers are, the stronger the user's power becomes. However, there are also many drawbacks to Full Counter: the user cannot initiate any attacks themselves, and they would not be able to reflect attacks if the opponent does not allow them to read the nature and timing of their attacks.
There are two variations of Full Counter. Meliodas can only reflect "magic" attacks; his version of the ability is useless against indirect attacks or an ordinary punch. He can supplement this ability through clones who can use it separately from the original. On the other hand, Estarossa can only reflect "physical" attacks.
- Counter Vanish「カウンターバニッシュ Kauntā Banisshu」: With his palm facing an incoming attack, Meliodas folds his thumb and little finger. He then, rather than reflecting "magic" attacks, completely disperses the attacks used against him.
- Revenge Counter「リベンジ・カウンター Ribenji Kauntā」: Meliodas turns off his abilities so that he can take damage. After Meliodas has taken enough damage, he charges his blade with power and strikes his enemy with it. This is considered to be Meliodas' ultimate attack. When Meliodas used Revenge Counter against Hendrickson, Gowther states that he has a survival chance of 0.2%.
- Seven Deadly Sins: A combination technique. Meliodas creates six clones with Lostvayne to reflect the attacks of each of the other six sins directed against the target: Ban's Banishing Kill; King's Sunflower; Diane's Rush Rock; Gowther's Blackout Arrow ; Merlin's Exterminate Ray; Escanor's Cruel Sun. After the initial reflection, Meliodas reflects them once again, merging all attacks into a single powerful one in the process.