It should be noted that this was only in the tenth chamber of Floor 30, meaning that they had to deal with at least a hundred over-Level 290 range monsters in each of the previous nine chambers of the Floor.
Naturally, it was kinda impossible for their levels to not blow up, as even Eliza who did not share Evan's absurd 400% Levelling Efficiency had reached level 300.
Unfortunately for the young hero, it seemed Adaptive Evolution was about to have its fun with him again, as he had been stuck on level 298 for quite a while.
The boss monster of Floor 30 was a Level 305 White-Eyed Blight Anaconda, a powerful gargantuan snake-like monster with a body that made the snakes from a 'certain movie with 5 parts' seem like toddlers.
Its scales were powerful enough to withstand almost any Tier 2 spell unscathed, and a few weaker Tier 3 Spells without issue, gaining even more defensive power when it infused its magic power into them.