Well, starky, i love the list. I have some concerns and thoughts, though.
1) Warp talons are draining too many points. Also, to gain more benefits from this formation, you should have more units. I suggest you go this way:
-Lord with Sigils , Jump Pack and Fisticlaw
5 x Warp Talons -
5 x Warp Talons -
5 x Raptors with 2 meltaguns , meltabombs
5 x Raptors with 2 meltaguns meltabombs
5 x Raptors with 2 meltaguns meltabombs
2) if you take a Cad or Purge detach, you will be unbound, since to use our decuion you need a core formation, that is Lost and the damned OR a Chaos warband
3) to really use at full power the talon formation, you should deepstrike them. So who's gonne be there turn 1 to avoid auto losing? 'cause your list above, autoloses....( a couple of unids from dreadclaw deepstrike are not going to resist, being this a 2000 pts battle and being them in the face of the enemy. Turn 1 you shuold hide and duck.and pray the dark gods, of course.)
To cover issues 2 and 3 i'd go with a minimum Lost and the damned base (it's the cheapest core choice, plus they respawn. they could represent histeric cults rampaging due to terror and the misleading words of the dark apostle)
then a terminator annihilation force with Sorceror + burning brand, and 3 units of 5 terminators with combiplasmas.
This should leave you enough points for a Purge detachment with a Sorceror and combimelta, 3 5 man Chosen units with 4 Plasma Guns (i always keep an ablative wound for safety) in Dreadclaws. Probably i'd want to take an aegis line with comm relay for rerolling all those reserve rolls and give cover to the cultists.
Sorcerors are there 'cause at minimun points they can have better damage output than a lord. Take double psy shriek and go to town.
I think that at 2000 this should all fit in. Make the calculations to be shure, though.
1) Warp talons are draining too many points. Also, to gain more benefits from this formation, you should have more units. I suggest you go this way:
-Lord with Sigils , Jump Pack and Fisticlaw
5 x Warp Talons -
5 x Warp Talons -
5 x Raptors with 2 meltaguns , meltabombs
5 x Raptors with 2 meltaguns meltabombs
5 x Raptors with 2 meltaguns meltabombs
2) if you take a Cad or Purge detach, you will be unbound, since to use our decuion you need a core formation, that is Lost and the damned OR a Chaos warband
3) to really use at full power the talon formation, you should deepstrike them. So who's gonne be there turn 1 to avoid auto losing? 'cause your list above, autoloses....( a couple of unids from dreadclaw deepstrike are not going to resist, being this a 2000 pts battle and being them in the face of the enemy. Turn 1 you shuold hide and duck.and pray the dark gods, of course.)
To cover issues 2 and 3 i'd go with a minimum Lost and the damned base (it's the cheapest core choice, plus they respawn. they could represent histeric cults rampaging due to terror and the misleading words of the dark apostle)
then a terminator annihilation force with Sorceror + burning brand, and 3 units of 5 terminators with combiplasmas.
This should leave you enough points for a Purge detachment with a Sorceror and combimelta, 3 5 man Chosen units with 4 Plasma Guns (i always keep an ablative wound for safety) in Dreadclaws. Probably i'd want to take an aegis line with comm relay for rerolling all those reserve rolls and give cover to the cultists.
Sorcerors are there 'cause at minimun points they can have better damage output than a lord. Take double psy shriek and go to town.
I think that at 2000 this should all fit in. Make the calculations to be shure, though.