So I recently decided to put in bloodborne again and try to make some progress on the game, (I stopped playing around the wilderness area, to play other games.)
I had the materials to do a chalice dungeon, and I never knew what those consisted of or what they did. But I went anyway and had a great time! Killed all three bosses/traversed all three layers without dying. Felt good.
The final boss was a "watchdog of the old lords?" Something like that.
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There are 4 groups of chalices. Each one with slightly different aesthetics and ranging difficulty. Depth is what difficulty it is, depth 4-5 is around end game level. You will get the main chalices if you defeat side bosses in the main story. You get "sub" chalices for completing a certain chalice. Chalice dungeons also have random drops for gems and such