What is the meaning of 'Clone Death's Nerf'?
There are three traits (Debilitating Dissipation, Crippling Dissipation, and Confusing Combatants) that trigger conditions on nearby opponents when a clone is killed by damage or replacement (when the Mesmer creates a clone or phantasm when they already have three illusions up). Currently these three traits trigger on opponents regardless of whether the opponent dodges, blinds the Mesmer or clones, evades, or blocks.
The change to these traits will allow dodges, blinds, evades, and blocks to counter these traits, meaning if the opponent does any of these four things they may avoid the conditions that the traits try to apply when the clone dies.
These traits do not trigger with shatters and should not directly indicate a nerf to shattering damage.
Edit: Also, Debilitating Dissipation is being changed further. Currently it has a chance of applying Vulnerability, Weakness, or 3xBleeds for 5 seconds. The Bleed portion will be changed to 2xBleeds for 4 seconds.