The Kaioken is a unique type of Transformation unlocked via items dropped from pre-Hardmode bosses. Each level of Kaioken must be unlocked in order. It, and its subsequent levels, is activated by pressing the Kaioken Technique key (default: J).
Kaioken drains health and creates a red aura around the player, which increases in size for each transformation. Each level of Kaioken is more powerful than the last, but requires more health to sustain, although the latter can be mitigated with the Kaio Crystal.
The first level of Kaioken is unlocked after using the Kaioken item, which has a 25% chance of dropping from the Eye of Cthulhu.
The second level of Kaioken is unlocked after using the Kaioken 4x item, which has a 25% chance of dropping from the Queen Bee.
The third level of Kaioken is unlocked after using the Kaioken 10x item, which has a 25% chance of dropping from Skeletron.
The fourth level of Kaioken is unlocked after using the Kaioken 20x item, which has a 25% chance of dropping from the Wall of Flesh.
Super Kaioken can be activated while in Super Saiyan 1 by pressing the Kaioken key. Notably, it is the strongest between all levels of Kaioken and SSJ1 forms, plus being the only one to add Defense and drain Ki like other forms. The form is affected by, but cannot contribute to, SSJ1 Mastery.
- All forms of Kaioken are considered debuffs by the game, similar to the Tipsy effect, and will be removed if the player heals with the Nurse.
- In the show, Kaioken puts a strain on the user's body depending on how high the multiplier is. This is replicated in-game by the forms' characteristic health drain and unique Defense reduction.
- Kaioken was a technique created by King Kai, however, Goku is the only being to be shown to use it successfully.
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