your Farseer needs Spirit Stones if you're going to use multiple powers.
i know you maybe be tempted to put the Farseer with the Guardians but don't.
if your strictly WYSIWIG i understand the disparity between the Scorpion Exarchs, but i'd give them both Biting Blades if possible.
i'd give both your Guardian squads EML or SL, though to save on points, consider Chin Cannons.
drop the Chin Cannons from your Serpents to save on points, give them EML.
make your Farseer as Cheap as possible: you could do extremely well with only Doom, Fortune, Stones, and a Singing Spear.
if you can at all take another Farseer, do it. attach the Farseers to the Scorps.
frankly, you'd do a lot better with Banshees against BT. if you take psyker powers to make Banshees hit better, I10 with PW + rerolls to wound and rerollable armor saves will slice TEQs like a laser through mash potatoes.
good hunting.
i know you maybe be tempted to put the Farseer with the Guardians but don't.
if your strictly WYSIWIG i understand the disparity between the Scorpion Exarchs, but i'd give them both Biting Blades if possible.
i'd give both your Guardian squads EML or SL, though to save on points, consider Chin Cannons.
drop the Chin Cannons from your Serpents to save on points, give them EML.
make your Farseer as Cheap as possible: you could do extremely well with only Doom, Fortune, Stones, and a Singing Spear.
if you can at all take another Farseer, do it. attach the Farseers to the Scorps.
frankly, you'd do a lot better with Banshees against BT. if you take psyker powers to make Banshees hit better, I10 with PW + rerolls to wound and rerollable armor saves will slice TEQs like a laser through mash potatoes.
good hunting.