You will start it in Forgotten Forest.
The quest Taro’s Regret starts near the Forgotten Forest entrance.
The fastest way to get there is by using a Warp Stone and teleporting.
Head to the gate where you’ll encounter the next boss, Mage.
The description of the boss fight is on a separate page of this guide.
After defeating the Mage, talk to Rusu.
A conversation will begin, followed by a short cutscene in which the barrier is broken.
This will let you progress further.
it’s possible for you to raise them.
The first two stones summon enemies, but the third one rewards you with Rot.
On the left there’s a hill you could climb.
Do so and move on.
On the right you’ll need to shoot crystals located on the trees.
After shooting three crystals, a Forest Tear will drop.
Place it on a small flower to dive into the true Rot form.
you could now destroy the obstacles in your way.The main path leads to the corrupted forest.
Entering the depths of the corrupted forest, you’ll encounter a few enemies.
Defeat them, then shoot the crystal on one of the trees to create a Forest Tear.
Use it to create a true Rot form and destroy some more obstacles blocking your path.
As you keep moving on and destroy obstacles, you’ll bump into some more enemies.
Defeat them and cleanse the forest.
You’ll find a shrine inside.
Purify it to gain a large amount of gems.
You should notice a dark chasm on the right.
You must jump down.
This path leads to the mission’s completion.
Once you reach the very bottom, keep moving forward.

The description of the boss fight is on a separate page of this guide.
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