Failed two aquarq harvesting missions in Deep Rock Galactic due to not knowing some of the threats I was facing.
First was in a snowy cavern, which had a frankly ridiculous enemy spawn rate despite being done solo. I ran entirely out of ammo, which has never happened before, and the mineral veins were well hidden so I was actually running around and looking for nitra while I had no ammo so I could call in more. Bosco and the harvesting platform saved me, and I finally found enough to call in a resupply. I gave up on my secondary objective of mining some mineral I'd never seen before, since I couldn't find more than one vein of it, and just finished the aquarq harvesting.
As expected, a big wave of enemies showed up, and I managed to fend them off, except I ran off an edge while backpedaling and used up one of my revives. Got back up and back into the fight, where I got knocked off again, to the same effect.
Then a big, orange exploding glyphid showed up. I managed to kill it, but severely underestimated the blast radius of its death boom, and died again. Lost an hour to that mission.
So, I tried again, this time in a cave with a bunch of thorny plants. I'd never seen any of this before, and stumbled into a stabber vine, which can kill you in two hits. I tried shooting it, but it didn't seem to have a health bar, so I assumed it was indestructible and was just an environmental hazard. The enemy spawn rate was much less insane in this mission, so over the course of another hour I managed to find the aquarqs I needed, as well as the mushrooms I needed for the secondary objective.
The only problem was that this took me past another stabber vine down a ledge. I was able to avoid it to harvest the last aquarq, but had to use a zip line to get back up. Going up the zip line was too slow, so it stabbed me off of the zipline and I fell to my first death. Got up, panicked and ran away, but ran into a corner. Second death. Panicked again and tried to run away, but same thing, third death and another hour wasted.
Then I looked them up and saw that they can be killed, which was very frustrating to learn. I even tried having Bosco shoot them with rockets, but it didn't seem to do anything in game.