Here’s the excerpt from the 12/16/19 KTEST patch notes.
Linker
Joint Penalty
The hit limit has been changed.
Current: 3 hits
After: [Skill Level] hits
The transferred damage has been altered and is no longer “fixed” damage but is now transferred as “melee physical” damage. The damage calculation is as follows.
[Damage Dealt] + (1 + [Number of Targets] * 10%) / [Number of Targets]
※When hitting 10 targets, 200% total damage is dealt, splitting to 20% damage to each of the 10 targets.
Basically, they changed it so that if more targets are hit, you gain an increase to the total damage you deal and each target takes more than a simple division of the damage.
Damage per Target
2 targets = 60% damage each (120% total)
3 targets = 43% damage each (130% total)
4 targets = 35% damage each (140% total)
5 targets = 30% damage each (150% total)
6 targets = 26% damage each (160% total)
7 targets = 24% damage each (170% total)
8 targets = 22% damage each (180% total)
9 targets = 21% damage each (190% total)
10 targets = 20% damage each (200% total)
The new patch buffed this scaling to increase the total damage dealt by 20% per additional target instead of 10% per target.
New Damage per Target
2 targets = 70% damage each (140% total)
3 targets = 53% damage each (160% total)
4 targets = 45% damage each (180% total)
5 targets = 40% damage each (200% total)
6 targets = 36% damage each (220% total)
7 targets = 34% damage each (240% total)
8 targets = 32% damage each (260% total)
9 targets = 31% damage each (280% total)
10 targets = 30% damage each (300% total)