Combat Expertise Envoy & Blast or Line Weapons

[D6Damager]

When using a weapon that hits multiple targets is the expertise die added to the damage of each target hit?

[HammerJack]

Almost definitely not. No official answer has been given, but the skill check is measured against a single target and the most similar ability with an equivalent answer is Stunt and Strike (which isn't a perfect fit, because of options that don't relate to the target)

From the FAQ:

Quote:

How does the operative's stunt and strike alternate class feature work when attacking with a weapon that affects an area or has multiple targets?

When attacking with a weapon that affects an area or has multiple targets, your target for the purpose of the stunt and strike class feature is the enemy with the highest CR that would be affected or targeted.

For example, if a stunt requires you to succeed at an attack or skill check, that requirement applies only to the target. Similarly, any effects that apply to the target (including making them flat-footed with a successful skill check) apply only to that target.

[HammerJack]

Additionally, read your AoE properties carefully. Some, like line, have these clauses:

"A line weapon doesn’t benefit from feats or abilities that increase the damage of a single attack (such as the operative’s trick attack)."