Follow Titus Actual guide here:    • OP Early Lightning One Shot God 2.0 G...  .

Note both the wrong warp to Crumbling and Faroth Dragon glitch still works as of 1.10. Wrong warp is a lot harder to get to due to the game loading faster, but closing the game still works, just harder to hit. Grab the ancient lightning book.

Use the dragon to level up to 40 faith + the minimum strength to wield the jelly fish shield, get the Erd Tree seal as mention in his guide and upgrade the jelly fish as high as you can. Howl of Sabriri + Golden Vow is a must. Then mix faith tear plus sparkle cracked tear(?) for the charge attack.

Ancient Dragon Lightning works great with large mobs, but Margit can be hit or miss since he's much smaller in dimension.