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Just compiling a list of things that can still be insta kill by force weapons and things that cannot. I am assuming Tyranid MC can still be force weapon killed? I guess MC daemons no longer can which makes no sense to me as that's what force weapons were created to do? A list would be nice as Ardboyz is this weekend and I have not played enough/read enough about 5th to know.

Tyranids within Synapse cannot be instantly killed. Outside of synapse, sure.

Most ICs can be instakilled, unless they have Eternal Warrior (Abbadon, Eldar Phoenix Lords) or have an adamantine mantle (SM). I believe that C'Tan can also be instakilled, though with T8 I don't think most librarians can actually hurt it in the first place.

Off the to of my head (there are sure to be some special characters I missed, like DH/WH stuff).
Cannot be instakilled/force weaponed
Chaos Daemons of any flavor
CSM Daemon Prince
Abbadon
Tyranids in Synapse
Space Marines with Adamantium Mantles
Phoenix Lords
Ghazghkull Thraka
C'Tan (iirc)

Notable units not immune to instant death
CSM greater daemon
Rest of the CSM characters/hq besides Abbadon and DP
Carnifexes, Ravs and zoeys out of synapse
Wraithlords
Avatar
Necrons Lords
Tomb Spiders
Nobs
Swarms of all kinds (except nurglings)
Ogryn
Lots more generic stuff (SM HQs, IG, etc)

Don't forget that SoB are immune to force weapons as well.

I thought an Avatar had Eternal Warrior?

No, the Avatar does not have it, he's in the same boat as the CSM greater demons.

Weird. The Avatar says "For all intents and purposes it's a Daemon..." I wonder if anyone's out there claiming RAW that that gives them Eternal Warrior, instability and demonic incursion...

Kharn is immune to force weapons as well, they're just a power weapon vs him

C'Tan aren't immune to Instant Death, only the Instant Death caused by the Wraithcannon in 3rd edition.

Yeah, but keep in mind that units with Tough 8 are impossible to wound with standard force weapons. (The DH's GrandMaster has a str 6 force weapon that could possibly wound a C'Tan on a 6, though it still gets its invulnerable save.

@ solkan: The Avatar is affected by Daemonhunters items and psychic abilities. That's about all that rule really does now.