Summoned by a lava-and-block ritual pattern, or the /ccode command.
Entity303 is summoned by building a specific lava-and-block ritual pattern, or directly through the /ccode command. The encounter lasts 2 minutes: lightning strikes repeatedly and day and night flicker back and forth.
One second after the ritual begins, a "Skinwalker Behind" appears directly behind the player. At the end, a crater forms with the message "See you again soon :)," and the player is kicked. Each altar location is one-time use and will not rebuild there again.