Optional: Ancient Wyvern
Maximum souls: 520,506
This boss is another gimmick fight, the gimmick being that you can perform a plunging attack to kill the boss in one fell swoop. The most difficult part is running past the hordes of Man-serpents on your way to the platform that allows you to perform the plunging attack. Follow the route as shown in the video below, casting Hidden Body as necessary.
Ancient Wyvern Boss Guide - Dark Souls 3 Boss Fight Tips and Tricks on How to Beat DS3
For those who are not comfortable with running past enemy hordes, the following video shows one way to cheese the fight. Stand at a corner, remove all your weapons and armour pieces, equip the Symbol of Avarice and these rings: Red Tearstone Ring, Flynn's Ring, Morne's Ring, Ring of the Sun's First Born. Use the weapon art of Bloodlust to bring your HP bar down to the amount that triggers the effect of the Red Tearstone Ring. Now remove the Symbol of Avarice, equip the Morion Blade in the right hand and Yorshka's Chime+10 in the left hand. Cast Sacred Oath and Deep Protection, lock onto the boss, and cast Great Lightning Spear.
Ancient Wyvern NG+33 Great Lightning Spear cheese, Dark Souls III
Here is a faster plunge kill:
