A possible concise summary is:
The speaker pranks his two friends who started a Minecraft server without him by hacking the server and spawning parasites that attack them. He pretends to help them but secretly unleashes more dangerous parasites until they abandon the server.
Here are the key facts extracted from the text:
1. The narrator's two best friends started a Minecraft server without them.
2. The narrator was bullied off the server every time they tried to join.
3. The narrator hacked into the server and installed a mod called "Vanish" and "Parasites".
4. The narrator spawned parasites on the server, which started to cause trouble for their friends.
5. The parasites were able to infect and take over other mobs on the server.
6. The narrator's friends were confused and scared by the parasites.
7. The narrator continued to spawn more powerful parasites, including a "Summoner" and an "Assimilated Bear".
8. The parasites were able to destroy blocks and summon other parasites.
9. The narrator's friends tried to escape the server, but the parasites continued to chase them.
10. The narrator's friends considered inviting the narrator back to the server to help them get rid of the parasites.
11. The narrator pretended to return to the server and help their friends, but actually continued to spawn more parasites.
12. The narrator's friends were eventually overwhelmed by the parasites and left the server.
13. The narrator activated a "Phase 8" mode on the server, which caused the parasites to spread and take over the entire world.
14. The narrator's friends declared that they were never coming back to the server again.