Damage Step
Face-Down Monsters
If you attacked a face-down monster it is flipped face-up now. If the face-down monster has a continuous effect it is applied immediately but all other effects activate later.
Damage Calculation – ATK/DEF Effects
Once this event begins all Continuous, Trigger, and Multi-Trigger effects that activate “during damage calculation” will form a chain, starting with any Trigger effects the battling monsters have. Counter Trap Cards, or Spell Speed 2 cards or effects that directly alter that directly change a monster's ATK or DEF can also be chained. There is only one chain and once it resolves this event is over.
Damage Calculation – Calculating Damage
This is when the monsters actually battle. Monsters destroyed by battle aren't sent to the Graveyard until later.
Attacked Attack Position Monster
Compare your monster's ATK to your opponent's monster's ATK.
If your ATK is higher, your opponent's monster is destroyed and your opponent takes damage equal to the difference between your monsters ATK and their monsters ATK.
If your ATK is equal, both monsters are destroyed and no damage is dealt.
If your ATK is lower your monster is destroyed and you take damage equal to the difference between your monsters ATK and their monsters ATK.
Attacked Defense Position Monster
Compare your monster's ATK to your opponent’s monster’s DEF.
If your ATK is higher, your opponent's monster is destroyed and no damage is dealt.
If your ATK is equal, nothing happens.
If your ATK is lower you take damage equal to the different between your monster’s ATK and your opponent’s monster’s DEF.
Direct Attack
Damage is dealt to your opponent equal to your monster’s ATK.
Damage Calculation – When Damage Has Been Inflicted
Cards and effects that activate when damage is inflicted are now/can now be activated and form a chain. There is only one chain and once it resolves this event is over.
Flip and after Battle Effects
After Damage Calculation, effects that activate due to a monster being flipped face-up or a monster having battled activate now, forming chains. Certain Spell Speed 2 or higher cards and effects can also be chained if they state they activate now. The turn players cards and effects activate first, chained by the opponents cards and effects.
Destroyed In Battle
Monsters destroyed in battle are now sent to the Graveyard. Monster effects that activate “when destroyed in battle” and other card effects that activate “when a monster is destroyed by battle” activate now, forming a chain. The turn players cards and effects activate first, chained by the opponents cards and effects.
End of the Damage Step
Effects that activate at the end of the Damage Step activate now. Once the Damage Step is over you can decide to go back to the Battle Step or continue to the End Step.