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The reason why Level 4 is so much stronger than Level 3 is the inclusion of an Awakening. Regarding this Awakening, Wang Tao doesn't know much yet and can only understand it through snippets of introductions.
Without a doubt, the strength after an Awakening is immense, but the difficulty of Awakening is also substantial. Especially the requirement for the last Hidden Attribute, which probably stumps most people.
However, for Wang Tao, Hidden Abilities are not an issue, considering he has three!
All he lacks now is Ability. As long as he upgrades the remaining two Abilities +10, then uses an Ascension Crystal Core to advance to Level 4, that should do it.
The only problem now is how to get a Level 4 Crystal Core. After all... Level 4, Lord Zombie Lords are too strong! And yet, he hasn't encountered any Fourth-order Elite Zombies...
When it comes to upgrading Ability... Wang Tao looks at the loot from this journey.