So far, in my tests in custom battles, they've became worse against elite infantry or entities with higher HP pool, but they absolutely destroy chaff now, since Doomseekers will most likely cross-hit enemy models.

I see the intent in the change to damage profile, but isn't the increase in splash targets just going to keep them from actually killing anything they hit?

What a nice idea.
I thought about buffing Doomseekers myself at some point, but I am still not sure how my plan of giving them an ability that grants them a little healing per entity killed can be implemented.
Maybe thats not even necessary anymore if your buffs do the job just fine!

I love the little flavorful traits they've been adding to units overtime. This fits extremely well.

Lol as usual my favorite parts of the DLC are the random special rules they bring in/spread around

CA just added this attribute to Wraithmongers, so I thought it should be added to Doomseekers too.

Flanking immunity is a genius idea: doomseekers DGAF about being surrounded, it just means a target rich environment