It would be cool. Maybe it can have piercing or split normal/piercing damage for variety. The other two troikas only have normal damage, and the avenger line has elemental damage already.
I don't know why it wasn't added, but maybe it can be added? Suggestion forum.
Gram should be split normal and elemental honestly. But I hope we can also get a Trojan sword as normal/shadow. And a Sanctuary version that takes the form of Lord Vanaduke's Mace and deals fire damage.