Artifact set

Deflection

Variable setFrom game data

Set bonus

Deflection

Set Bonus (1 pcs.): +20 ACC
Set Bonus (2 pcs.): +10% SPD
Set Bonus (3 pcs.): +20 ACC
Set Bonus (4 pcs.): 35% chance to deflect any debuff onto the attacker. Places a Block Debuffs for 1 turn at the start of a Round.
Set Bonus (5 pcs.): +10% SPD
Set Bonus (6 pcs.): Wearer deals bonus damage proportional to their own ACC to enemies that block debuffs from the wearer. Occurs once per skill. This damage can remove Total Guard stacks.
Set Bonus (7 pcs.): +20 ACC
Set Bonus (8 pcs.): +12% SPD
Set Bonus (9 pcs.): Ignore DEF effects are 10% less effective (5% for Bosses) for each active debuff placed by the wearer.

As the game's own text says: Variable Set: +60 ACC, +32% SPD, 35% chance to deflect any debuff onto the attacker when a debuff is placed on the wearer. Places a Block Debuff buff on the wearer at the start of the Round. Wearer deals bonus damage proportional to ACC to enemies that block debuffs from the wearer. Ignore DEF effects are 10% less effective (5% for Bosses) for each active debuff placed by the wearer.

The game calls this a variable set: the bonus depends on the number of pieces equipped. Each row is the game's line for that number of pieces.

What the pieces look like

Weapon
Helmet
Shield
Gloves
Chest
Boots
Ring
Amulet
Banner

Artwork from the game files. Which pieces and slots a set can drop in is not stated in the game data used here.

Other variable sets

The text is the game's own and has not been tested in battle here. The game data does not say here where the set drops or which champions use it. See Data quality.