Kill them both and advance up the stairs. There’s another shielded grunt on the stairs who will spring up if the overseer completes his screech. There’s an overseer on the stairs so it’s a good idea to clear the shielded grunt from the path above where you spotted the third Crystal Lizard – if he’s not already dead – as well as the crossbowman pretending to be dead nearby. There’s another hostile grunt opposite the two passives. Don’t be distracted by the two passives you’ll run past as you pursue it, but do be careful of the shielded grunt who may drop down from behind you.

Look back the way you came and spot the ramp leading upwards – and the third Crystal Lizard on it, which carries a Heavy Gem. You can pick up the Lightning Spear spell and a Dragon Crest Shield near the dead dragon. There are two Crystal Lizards here who drop Large Titanite Shards. Turn left and move carefully along the narrow ledge until you reach solid ground. When you reach the dead end at the closed gate, turn right again to drop down from the broken section of wall. Observe the Stray Demon boss to the left. Take the lift up from Old Wolf of Farron and go up the stairs. Dark Souls 3: Old Wolf of Farron to optional Stray Demon boss