As Genshin Impact 2.6 beta draws near, there are plenty of unverified leaks out there; one of them covers an artifact set tailor-made for Xiao.
Its 2-piece effect is nothing special, as it just gives the user +18% ATK, which is the same as the 2-piece effect of Shimenawa's Reminiscence and Gladiator's Finale. The more interesting effect is its 4-piece one, which does the following:
At its best, the 4-piece set gives its user a 66% ATK boost:
If this Genshin Impact 2.6 artifact set leak is legitimate, then Xiao users can rejoice in knowing that they got an artifact set seemingly made for him. His Elemental Burst constantly drains his HP, making him achieve the 66% ATK boost more efficiently than other characters in Genshin Impact 2.6.
Not only that, but his Elemental Burst lasts for 15 seconds, which is just one second shorter than the ATK boost duration from the 4-piece effect. Xiao infamously doesn't have many other options to consider, especially when it comes to 4-piece sets.
Another leaker, GI Front, stated that Tz's Genshin Impact 2.6 leak about the upcoming artifact set is accurate. There is a good likelihood that these Genshin Impact 2.6 leaks are authentic, but Travelers should take it with a grain of salt until the upcoming beta leaks come out.
Technically, any character can take damage after casting their Elemental Burst. However, it becomes inefficient to wait for an enemy to do so (not to mention unviable in the hardest floors of the Spiral Abyss).
A character like Hu Tao can cast her Elemental Skill to hurt herself to get one stack, but she would still have to rely on getting hit to reach the complete 66% ATK boost. This new set is described as tailor-made for Xiao, given that no other character can easily reach
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