I believe Single Player is running the Beta version

Conan Exiles PC Discussion
1

By playing the two version I noticed the following after running the new dungeon several times in both modes:

Official server: Found legendary King weapons, armor pieces, and statues.
Single: Never found any of the above, except one (1) King’s Hood.

I also noticed a difference in the legendary fragments appearance:

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In single player, while in admin mode, the new legendary weapons, armors, and statues do not appear. Also, in Single Player, after beating the last boss, putting the King’s Hood I found in the anvil along with legendary fragments and fragments of power, I could not repair it. The button was greyed out.

This led me to believe that the Single Player portion is running the Beta instead of the version the Official Servers currently have.

2

RNG issue.

All the stuff dropped for me in single player. The drop rate is surprisingly low - too low imho -, but they do drop. I have two complete armor sets (or a bit more) and several weapons after about ten runs. But there were runs were nothing at dropped - I though the dragon didn’t drop anything for most of the time. With a drop rate so low, it’s not unlikely that one or a few players do several runs without anything dropping. And that unlucky few apparently includes you.

Still an issue - the loot from that dungeon is unappealing overall. But not a technical issue.

3

Given the effort to reach and kill him, at least one drop should be guaranteed