Jak 3: Part 10: A Temple Search Towards the Light

With Dark Invisibility, you can now explore the Monk Temple for real by first getting past that mystic eye.

Further ahead will be crowds of big spiders like the ones that are in Mar's Tomb in Jak II.
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After the long stairs, you will find a room with a Dark Eco Vent. This maximizes your Dark Eco, and you'll need it for the next room where there are one-hit killer robots. The quickest way to get rid of them is to Dark Blast them as soon as you approach them, but the longer and cooler was is to go invisible, sneak around and in their circle to hit their guarded switch, and then Dark Bomb them all from behind their backs!

Another thing: Daxter's quips to a dead Jak are back from the first game. However! Your only chance of hearing them is if Jak's death animation is the same, only one that he had in the first game. The animations Jak gained in Jak II do not have this privilege.
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Further ahead Veger returned, and was pushing Seem and the other Monks to finish the work he had them do while he was plotting something against Haven City. He's looking for the Catacombs...

Besides that Jak & Daxter walk up to a massive Precursor statue. He warns Jak that the fate of the world was in grave danger, and that only he was the one capable of saving it.

To help Jak with his mission of saving the world, the statue offered to a him radiant Light. This Light removed the Dark Eco's uncontrollable influence on Jak's body.

This was the work of refined Light Eco! Now, Jak can also become Light Jak!
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While Dark Jak is more focused on aggressive combat, Light Jak is focused more on supportive abilities and skills. The first Light Jak power you get is Light Regeneration, which heals each blip of damage for some Light Eco.

You need other abilities to stay in the Light Jak form, though. Light Regeneration doesn't have this.

Unlocking Light Jak also unlocks Light Eco Vents. The work just the same as Dark Eco Vents.

This is one of my favorite things in this whole game. Being able to use Light AND Dark forms. It's pretty fun that a character can do this!
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The rest of this video has mean going back to Spargus City, both while and after doing so getting some more Oracle challenges does.