Here's something for Minecraft Java datapack lovers: Dark Swarm - Behind The Scenes series!

In this series, I'll briefly explain what's happening under the hood of Dark Swarm datapack.

The first video article shows us that Darkness mobs are nothing else than invisible Zombies & Drowned. Because Zombies sink and Drowned cannot break doors, we need to smartly replace one with another. The way Dark Swarm achieves that is done in-place and almost unnoticeable for players.

Another interesting trivia is that because invisible mobs are visible for their first tick, Dark Swarm mobs spend their first tick way below the bedrock, in the void! Only after first tick they are teleported to where they spawn. Meaning each Darkness literally comes out of this world :D