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Autarch, jetbike, laserlance.
Troops: 10 Pathfinders
10 Dire Avengers, exarch with 2 catapults, bladestorm, wave serpent, with star engines, TL brightlance, spirit stones.
10 Dire avengers, exarch with power weapon and SS, with defend and bladestorm.
10 Dire avengers, exarch with 2 catapults and bladestorm.
Fast Attack: 4 Shining spears, exarch with withdraw, skilled riders, and starlance. (Autarch joins this unit).
This makes around 1350 pts. Leaving around 650 pts. Lots of options here. Considering: 10 Fire dragons, in wave serpent with EML, or 10 banshees in wave serpent with brightlance, or a pair of fire prisms, or even some wraithlords (though that may be less consistent with the theme of this assault force).
Seeing as theres an autarch, it would seem logical to use his special ability, hence warp spiders are an option.
Something about falcons that one can't help but dislike.
This core assault force listed above apears to excell at taking out hordes/marines, but one thing that remains a concern is armour. ie AV14 armoured companies, land raiders and monoliths etc.
We're all friends here. Feel free to comment.
In my opinion, go with the fire prisms, maybe put all your squads in vehicles for anti-tank, and objective grabbing. You may want to split your pathfinders into two squads for more firepower versatility. If you have points left, max out the shining spear squad, they become much more points efficent the more you have.
On a side note, why does every eldar list i see spam dire avengers now? i know troops are important, but remember the humble guardian, and guardian jetbikes. If you destroy their army before turn 6 you win anyway, so elites are still viable.