>>96349120
"Elfs with big fucking swords" was a thing in all 3 elf races back in whfb (executioners, swordmasters, wildwood rangers) so thematically it would make sense for the idoneth to have them, being composed of a vatiety of elven souls.
Idoneth just need more Infantry man, it's the visual backbone of an army and idoneth have a grand total of two (2) options. Give them their heavy armoured elite swordguys. While we're at it, give them an elite ranged unit too. Maybe the shaerk riders with their net launchers, is maybe a bit more in theme than big crossbows.