When patch 1.04 hit, I cleared the first Sacrament Dungeon and didn't like it that much.
Yesterday, after downloading 1.05, I tried doing other 2. One of them required to run around a big doughnut shaped area and kill certain mobs to make the boss pop. It was tedious, but easy to get an S rank.
The other, in the forest location didn't seem to have any gimmick, but it was so dark, that I could barely see where I was going, the map was pretty much useless and I just turned off the console after bumping into one wall after another.
Definitely not a fan of these dungeons. Running around between bases to protect them (gives you points which go towards your rank) and making the boss show up in very dull environments isn't fun in the slightest. Better stock up on SPD potions and have some movement speed skills on you.
Here's the guide in Japanese showing the point requirements for each rank, rewards, maps etc.