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Thins you didn't know about: The Spider

On hard difficulty and a full moon, Spiders has a chance on spawning with status effect(s) and the status effects can be a regeneration, swiftness, strenght, or even invisibility. All these effects has an infinite duration

You can still see the Spider's eyes even it has an invisibility

When set on fire, Spiders shows massive flame texture unlike any other mob in the game

The looting enchantment does not affect the number of spider eyes dropped

There is a 1.01% of spawning skeleton riding a spider making it a spider jockey