[bug][0.86] Typo and missing graphic for Onyx Throne

Not to mention the game is awfully flaky on whether it will actually allow you to build it.  And in the rare cases where the game does allow you to build it, it doesn't actually appear on the map or take up any space.

This bug is likely due to some art not being finished for a few tiles. The tile says K_SkathPit_01, which is a tile that does not exist. There are actually 3 buildings that are using this tile name. It would seem to be a placeholder for art that will be added later. It would have been nice if they picked a placeholder tile that does exist, but you can always just use a tile you like that is already in the game. I made my own tiles for each one from the WoM tile designer and added them to the new game. I wonder what the dev's version of Onyx Throne will look like.

Some of these buildings with no graphic can still be built, it's just that you can't see them to place them on a tile in your city.  So it's kind of random where they get placed.

It was the best L5 building for me, so I picked it and could not build it.

Anyone have a full list of the special building options at L5? Maybe a full list for each level?

I think there are only about 7 level 5 buildings. Onyx Throne is the only good one. The rest belong in level 4. You can very easily just replace the tile they used with any other tile in the game to fix the problem. I made my own Onyx Throne.

One L4 city with a prison and one L5 city with Onyx Throne and  normal tax = zero unrest

I always get the same upgrades for each city as population means more then anything else for me.

L2 = Garden

L3 = Bakery

L4 = One city with prison, the rest the research building 

L5 = Onyx Throne (but I normally only get one city to L5)