Ancient Wyvern Boss Guide
Dont ask how many tries it took for that take....
This is the best way to approach the Ancient Wyvern fight, run towards that ledge and situate yourself to wait for a horizontal fire attack or a forward fire attack, then do a plunging attack towards the wyverns head and it will count on his critical hitbox.
This is a covered strategy already but I thought I should share a quick video on it! Thanks!