This purity allows the Marked Undead to continuously improve themselves if they have enough energy, thereby gaining strength comparable to or even surpassing that of higher-level Skeleton Undead.

Of course, there are also multi-attribute Emblem Undead, which Li Ziyu can also summon, but it depends on the number of times they are enchanted. What he can create now is Emblem Undead with 3 enchantments, but fortunately he did not summon them, otherwise he would have suffered a huge loss.

The Marked Undead also have their own structure. Judging from the combat power of the ones that have just been summoned, the skeletons with multiple marks are obviously stronger than the skeletons with a single mark. However, precisely because of the multiple marks, it is very difficult for these skeletons to improve their own strength. Instead, they will be surpassed by the skeletons with a single mark after a period of time.

Therefore, there is a separate hierarchy system among the tattooed skeletons. The more tattoos one has, the lower one's status is. The fewer the types of tattoos one has, the higher one's status is.

Below the Marked Undead are the humanoid alien undead. Their internal class is very different from that of the Marked Undead. Regardless of race, the alien undead with a single attribute are at the top and have the opportunity to be promoted. However, for those with other attributes, it is the opposite. The more types of marks on the body, the better. Well, there is no chance of promotion.

Further down, there are creatures similar to skeleton beasts. The class of these guys is completely opposite to that of the tattooed undead. The more types of tattoos on their bodies, the higher their level. After all, they have no chance to improve themselves, so they appear as they are.

To explain it simply, the Dark Skeletons and Violent Skeletons, with enough energy, can eventually rival or even surpass the most powerful Skeleton Undead, and the Dark Bull Demon, an alien Undead with a single mark, can also be upgraded to a relatively strong level. But the Skeleton Beasts, well, are very strong at this stage, and are basically equivalent to cannon fodder in the later stages. You can use them casually without any regrets.

In addition to the introduction and class of the alien undead, Li Ziyu also discovered some secrets about the patterns. It turns out that patterns are also divided into levels. For example, the dark pattern is a high-level pattern. The violent pattern and the plague pattern are not as good as the dark pattern. They belong to the middle level of the pattern level, while the speed pattern, strength pattern, physique pattern, etc. are low-level patterns.

The grade of the tattoo determines the strength of the tattooed undead in the later stages and the speed of its improvement.

There is also some information about alien undead in the system. The information indicates that alien undead are different from normal skeleton undead, especially the patterned undead. Their thinking is more active. According to Li Ziyu's own understanding, the skeleton undead are basically stupid, while the alien undead are smart people who are good at thinking.

After reading these introductions, Li Ziyu took a deep breath and silently repeated the word "dog system" 108 times in his mind. He almost missed the big thing.

If you don't read these, it would be difficult to understand the previous system's introduction to undead such as Dark Skeletons and Violent Skeletons. It also explains why Dark Skeletons are dangerous and don't care whether there are friendly forces around when fighting.

I understand.