Damn, I wish they had more artefacts/traits. I was presuming that would be the bulk of the book. Gargants are all about looted trophies so it's a bit jarring the artefact cap is 1 or 2 with a Krakeneater.
They're mostly uninspired too, very mathhammery. What a shame. I was hoping for 6/6/6 for each Mega then an equivalent to Mancrushers, like maybe a unit of 3 could unlock 1 for their "champion", and the usual subfaction stuff.