Spider Spawner XP Farm

One thing sets a spider farm apart from a zombie or skeleton one: spiders climb any solid block face, straight up walls included. A drop shaft built the way you'd build one for a zombie will just let spiders climb right back out, unless the whole shaft is lined with something they can't grip.

The fix is half-slabs, glass, or other non-climbable surfaces for the entire shaft interior. Spiders can't get a grip on a thin slab edge or on glass the way they can on a full block, and that's the single biggest thing to get right here compared to just copying a zombie-farm layout.

Fence gates show up in the funneling section more often than plain fences, specifically because spiders are unusually good at squeezing through diagonal gaps and around corners that would stop a zombie flat. A tighter, more carefully sealed funnel than a zombie farm needs is just standard practice.

Every so often a spider spawns as a jockey, a skeleton riding on top, worth knowing about just so an unexpected arrow from a supposedly pure spider farm doesn't catch you off guard. Most designs handle it fine as-is since the rider dismounts and dies in the same drop.

String feeds bows, crossbows, fishing rods, wool in a pinch, and looms, while spider eyes are the base for Potion of Poison and, fermented, for slowness potions and the Bedrock-specific Infestation potion used elsewhere on this page.