So, I'm an extremely new player (have so far defeated a grand total of 1 Lieutenant) and I ran into one of these setting up my latest Wind Shelter. I saw it had roughly five times more HP than any non-Lieutenant boss I'd fought, was huge, and weak to Entropy, so I picked the spell that fires entropy bolts left and right, and found it wasn't doing any damage. I forgot to check the boss' level, but it had massive entropy weakness and an armor rating of 10 (compared to my spell's 15 penetration). I tried pretty much every spell in my repetoire and couldn't deal it any damage, so I just ran.
It's the first creature in the game to completely no-sell my attacks, so I'm just wondering what I'm missing. Is there some special tactic required to fight them? Am I just still way too low level?
Edit:also is there a way to zoom in the minimap (Chunk Map?) I'm using a widescreen monitor, and while I don't mind making it bigger, I find it is perfect in large outdoor areas, and a nightmare to try and read in Lava Escape missions when I need it most with my poor eyesight.