Don't know if I'm late but here's the video on how to complete it if you get stuck

After the update v1.1.1 (that was supposed to fix this) I am still not able to interact with the Tablet in Old Cellar.

It's literally still the same. When I spilled the wine long ago, tablet did rise up but I couldn't interact with it. And now after the most recent update (v1.1.1.) it's still like that.
It's on top but I can't interact with it.

Edit: I play on PC. When I get inside the Old Cellar, I can only shoot barrels that are hanging on the rope and that's it. After I do it nothing happens since I already shot those barrels and opened the ones on the floor long ago. Tablet is up already and that doesn't change. I tried veryifying game files, fast traveling, restarting my game, loading earlier save... Nothing happens.

This issue wasn't fixed with update v.1.2.2 how it was supposed to.

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@gamingolddude The issue is caused by one of the new abilities in Bear tree - Heidrun Slam. Unequip it and you'll be able to sprint on horse again

@lj4mma it's a really good game, i enjoyed the story, the combat is really cool and mythological things are really interesting and fun.. one of the best AC games IMO and i played all of them

@gamingolddude The issue is caused by one of the new abilities, Heidrun Slam.
Workaround for this is to unequip that ability and you'll be able to sprint on horse again.

@password1234xxx I think you need to complete the questline from the first 3 River Raids in order for new ones to appear

I was also able to get Excalibur actually. Didn't notice the tablet appeared in my inventory.

However, we still can't actually complete the Old Cellar mystery and still can't get that "Complete all Territories" achievement.

@ubi-nacho Thank you for the update on this! Good to know the team is still working on fixing this issues 100%, however we really appreacite that we're able to get Excalibur now

@centralapollo54 They said new game plus will be one of the last few things added to the game, so expect it late 2022

Don't know if I'm late but here's the video on how to complete it if you get stuck

@guest-stdfcqkx The tablet was added to our inventories in latest update, if you're looking for that. You can go claim your Excalibur

@weaselmilkerstc Latest update added the missing tablet to everyone's inventory. Check for yourself then go to the specific cave and collect your Excalibur

@ubi-woofer I totally forgot about her but yeah she's back now. Sorry for the late reply

@budor-hassanain lucky you lol i can't find anyone to avenge

@thenorfolkian just follow the quests guys.. you'll get to go back to some rivers and collect weapons then by defeating champions

@ubi-nacho Thank you for the update on this! Good to know the team is still working on fixing this issues 100%, however we really appreacite that we're able to get Excalibur now