The largely uninhabited boreal forests and tundra of Tyrea now shelter the Eldar come to Kronus from Craftworld Ulthwé. Before their arrival, only a few wild men and feral Orks called Tyrea home.
From the shores of the Northern Sea to the foothills of the Ariels, Tyrea is a harsh land. Ice fields give way only grudgingly to tundra and boreal forests and a cold wind seems to blow year round.
- +100 Planetary Requisition
- Remove the Eldar from the campaign
The Eldar will launch semi-frequent raids on your base so make sure to build a few bolt turrets or keep a squad or two present to deal with them and you should be able to focus entirely on your own assault.
Build your forces and target the ork base first, the moment you attack the Eldar encampment a band of Chaos Space Marines will spawn but they can wait until the greenskins have been put to rest. Releasing the squiggoths at the right time is tricky, you don't want to have them simply rush up to the enemy base only to die on their way, but it can be very rewarding if you time it right.
The Chaos base is none too hard and should fall to an infantry/artillery combination, (At this point, you might want to send a few lower tier units to their deaths to give room for more powerful units) afterwards you should replenish your forces and upgrade them as well.
You only have to hold the three critical points to win, but faced with the Avatar of Khaine and ample infantry you might want to keep the Eldar forces engaged while you capture them, though risky you could attempt to capture all at once.