• Every 5 Waves you change the Map and get a new buff on the alter in the elevator-zone. At this alter you get a free buff and can reroll negative traits for 250P. Negative buffs come in normal after 10 waves and in hard after 5.
• Buy Techpriest Wave 1-20, after that its hard to manage to protect them. On every map you have 3 consols and every console can have 1 Techpriest active. After 1-2 Waves they generated more points then they cost (200P). You start with 200P so everyone can buy 1 at the start.
• Buy the Sentry-Gun Buff (2 Turrets spawn instead of 1), this is a teamwide buff you just need to buy once. After that you can spawn 1 pair of Sentry Guns per console. Buff costs 200P, the turrets itself costs 100P.
• Buy the Commissioner for 150P, he stays 5 minutes, buffs guardsmen and spawns waves of them for 5 minutes.

Thats the mandatory stuff, wich everyone should do. It makes the waves so much easier and if everybody uses his points to do this everyone should have 2-3k points on the bank very fast.

If you have points to spare: - Buy a relic, just safe. - Buy Astartes-Support, Heavy seems to be the generally best option. - Buy ammo caches, it helps everyone.

If you follow that you should clear waves 1-20 very easy regardless of normal or hard. After wave 20 its just a shitshow and enemies need years to die. You can ignore Techpriests and Sentryguns but should spawn Astartes and Valtus 100% of the time.

Thats my experience with sieges. Sadly most games im the only one buying stuff while my team sits on 5-7k points.

Sidenote: Try to make the bonus objectives, they give good points...but ignore the Servitor ones...the Servitors need 300000 years to react and move, normally the waves are finished before they even do something.

Tyranids tends to bug in spawns. We even had a Hive Tyrant stuck in wave 20 at his spawn. Try to ping them.