Short Guide on How to Unlock the Secret Character Gyorunton in Vampire Survivors.
To unlock Gyorunton, simply enter the Boss Rash stage and survive for 15 minutes with only one weapon.
It is recommended that you use the Mindbender relic, which you unlock by filling 50 entries in the Collection or by casting the spell 'teleportustomars' in The Forbidden Scrolls of Morbane. This relic lets you set a maximum number of weapons you can have in a run. It will help you avoid accidentally leveling more than one weapon and ensure you only get passive items as level-up options.
An alternative to the Mindbender relic is the Game Killer (0) Arcana, which is unlocked by defeating the boss in Cappella Magna. Upon obtaining this Arcana, all XP gain is halted, thus also helping you avoid accidentally leveling more than one weapon.
If you prefer, you can unlock Gyorunton using a cheat code. Simply access the Secrets menu, which you can find in the main menu if you've unlocked The Forbidden Scrolls Of Morbane. Then, enter the code 'secondevolution' and you will have Gyorunton unlocked.