I came back a lot later, with a lvl 23 Shaper, 2 lvl 20+ Fyoras, 2 lvl 20+ Cryoas, 1 Roamer + Greta (with Acid spell improvement) and Alwan. Each of them augmented and used a Protection and Mass Energize before.
The 1st and 2nd tests are easy, the 3rd is a lot harder, then the 4th a bit easier again (I think) because the Pylons die a lot easier and you if you stay at one edge of the room some cant attack you.
The last test with 5 Golems is really really tough and cost me a lot of healing spores, speed spores, you name it. It's only worth it for a Shaper, I think.