Invulnerability Glitch

Invulnerability glitch, sometimes called invuln, is a bug that allows Jak to stay alive while in a dead/dying state. The glitch is primarily used in the Any% and Gunless categories to assist with boss fights and make specific skips possible.

Tutorial

Technical

The invulnerability glitch has two different states: State 1 and State 2. More commonly referred to as Invuln 1 and Invuln 2. To enter State 2, Jak must first enter State 1 and then take fall damage.

There are a few known ways to enter State 1 invulnerability:

Dismounting the JET-Board in a death plane on the frame Jak should die
Taking damage on a certain frame during the Restart Mission sequence
Swimming up through a plane of Dark Eco (diving into the side of a Dark Eco pool)
Spin kicking and shooting (Wastelander Move) in lava on the same frame you should take damage

To exit the invulnerability glitch:

Bonk into a wall
Clip into an enemy character model as it is attacking
Use the warp gate
Die in the void
Restarting a mission from the pause menu
Loading a save file
Dying from too much fall damage

Invuln 1

Enemies will no longer target Jak.
Jak can't pick up ammunition, skull gems, eco, or precursor orbs.
Jak can't use vehicles, weapons, Dark Jak, or the JET-Board.
Jak can't speak to non-playable characters or side mission holographic terminals.
Jak can't ledge grab.
Jak can walk on all death planes except the void.

Invuln 2

To achieve the second state of invulnerability, Jak needs to take fall damage. Or splat as most people call it. The splat animation that occurs when taking fall damage acts as a check that lets the game know that Jak is still alive. After the splat, all of the side effects of Invuln 1 will be negated except the main invulnerability effect.

Discovery

The JET-Board method of entering invulnerability State 1 was discovered by Djtomjak73 on September 11, 2015.

OutrageousJosh discovered a consistent way to enter State 1 by taking damage on an exploding zoomer during the Restart Mission sequence.

Glitches, Bugs, Exploits, and Secrets
Jak and Daxter: The Precursor Legacy	Audio Pause Glitch • Boat Pause • Bridge Blast • Cheat Mode • Dark Glitch • Developer Mode • Developer Pictures • Drunk Cam • Dupe State • Easter Eggs • Flut Flut Escape • Game Crash • Ghost Glitch • Hard Fish • Idle Deload • Line Glitch • Moon Walk • Orb Duplication Glitch • Pause Buffer • Pause Cutscene Trigger • Punch Glitch • Statue Glitch • Texture Corruption • Void Out • Walking While Talking • Zombie Glitch • Zoomer Escape
Jak II	Cheat Mode • Developer Mode • Developer Pictures • Easter Eggs • Game Crash • Ghost Town • Invisibility Glitch • Invulnerability Glitch • Line Glitch • Orb Duplication Glitch • Pause Buffer • Peacemaker Stacking • Percentage Warp • Punch Glitch • Stadium Bug • Statue Glitch • Zombie Glitch
Jak 3	Cheat Mode • Developer Mode • Developer Pictures • Easter Eggs • Game Crash • Invisibility Glitch • Invulnerability Glitch • Line Glitch • Orb Duplication Glitch • Peacemaker Stacking • Percentage Warp • Punch Glitch • Statue Glitch • Zombie Glitch
Jak X: Combat Racing	Autosave Bug • Cheat Mode • Developer Mode • Easter Eggs • Line Glitch
Daxter	Dream Orb • Easter Eggs • Palace Vase Orb • Teleporter Menu Storage
Jak and Daxter: The Lost Frontier	Easter Eggs • Scene Player Skip