As promised, here are the demon ruin pointers. If you go deeper into the ruins there is an NPC who drops an ultra greatsword, and further yet there is an ballista switch, which you can use to turn off the giant ballista on the outside. Before you do that do be aware thar there are some destructable walls which can be destroyed by standing near them and then moving out of the way while ballista fires at you. Similarly theres a miniboss outside the old demon king arena, just go straight outside of the door until he spawns, usually people trigger him and take cover behind the hill by sitting down with a gesture to have a ballista kill him. Sirris questline is on hold until you kill irithill final boss, but killing the dancer does open a way to do some fun things. You can get moonlight greatsword from boss soul there. Just up the ladder from the dancer arena and then turn left to get to kings garden, beyond the boss arena there is a door, a gesture you get there will open a way to a secret location, and behind the gesture pick-up there is a secret wall with yet another secret location behind it.
