Smogweaver is a controller spider enemy. At the lowest Threat it has 58 health, hits for 10 and carries 0 armor. It moves at 2.6, can reach you from 1.9 away, and telegraphs each swing for 13 ticks before it lands, then waits 30 before the next one.

It is part of the shared Demon Gate crowd rather than any one biome, so it can show up almost anywhere.

Killing it pays 14 XP, and it drops something 6% of the time.