Just place your sign there or summon other phantoms. It is a great place both for spectating and fighting. Immediately past the bonfire on that little balcony/open area you will see tons of summon signs. The most popular location at the current moment is right outside of the Pontiff Sulyvahn Bonfire in Irithyll of the Boreal Valley. So before you can even start to PvP, you need to know where everybody is scrappin'. Here is a great Reddit thread that may help you: These covenants include the Watchdogs of Farron, Blue Sentinels, Aldritch Faithful, and Blades of the Darkmoon. There are also covenants you can join that will auto-summon you to other people's worlds for PvP.

If you see a summon sign that is red, it means that someone else used the Red Sign Soapstone - if you interact with the red summon sign, you can summon them into your world for PvP. You can also get the Red Sign Soapstone from a spell-casting worm outside of the Rosaria's Bedchamber bonfire (in Cathedral of the Deep), which allows you to be summoned for PvP in other people's worlds. If you continue to follow Leonhard's questline, you'll eventually get a Red Eye Orb, which can be used an infinite number of times to invade. You can get more of these items from the dark wraiths near the Farron Keep Perimeter. He will give you Cracked Red Eye Orbs, which are one-time-use items that allow you to invade another player's world.

When you return, there should be an NPC named Leonhard leaning against Lothric's throne. The fastest way to start PvP is to reach the second bonfire at the High Wall of Lothric, then return to Firelink Shrine.

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