How to order the black classics of the strongest snail undead?

The Black Sutra of the Undead is one of the intelligence interfaces in the Ero area of the strongest snail. As shown in the figure below, the recommended unlocking sequence here is to follow the route indicated by the red arrow first, then blue, and finally green. Wherein the red circle position unlocks the fingertip quicksand. After unlocking, you can use the skip function. This can save a lot of tower defense time, so it is a necessary function. Players are advised to give priority to unlocking.

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How to unlock the black classics of the undead?

When the player unlocks errol's intelligent interface, the page of Death Black Classics unlocks the corresponding chapter, and opens the map of errol-the past to unlock this brand-new intelligent tree.