Lets talk about the center artifacts

[Trim]

I have managed to find 7 out of 8 artifacts on the center, The northern ice cave has Artifact of the clever and Artifact of the Devourer. Southern ice cave has the one Artifact of the Skylord. Then the Big lava cave on lava island has the artifact of the massive, along with the small lava cave holding the two artifacts Hunter and the Pack. The 7th artifact is in the large south east cave with multiple entrances, you gotta swim down for it. Now every guide I read says that artifact in the south east cave is artifact of the strong. It is not though, its artifact of the immune. The last location of the artifact (immune) is supposed to be inside the floating island cave. It doesn't seem to be there anymore. I have no idea where to find the artifact of the strong on the center map, can anyone help me out?

[Eightball]

There's no artifact in the floating island.

2 in Nortth Ice
none in center cave
1 in south ice
2 in small lava
2 in big lava
1 in the 69.7, 59.6 cave

[SgtSausagepants]

Artifact of the Immune is actually in a cave beneath one of the central river ruins.

Roughly at 70, 60. There are other entrances above ground but the artifact chest itself is deep underwater. If you come in from the river the only real threat seems to be piranha.

Strong is in the big lava cave, there are several artifact chests there.