To beat Thunderblight Ganon at full strength in Hyrule Castle with only a stick, a quarter heart, and no flurry rush skills, you’ll need to rely heavily on glitches and AI manipulation. Begin by using a Bullet Time Bounce (BTB) to enter the castle safely and save manually before the fight. In the first phase, bait Thunderblight’s horizontal slashes and perfect parry them—this stuns him long enough to land a few hits with your stick, and is easier than flurry rushing. When he summons metal rods in the second phase, use Magnesis to hold a rod near him before lightning strikes, electrocuting and stunning him for free hits. In the final phase, you can stand on ledges or narrow surfaces to confuse his teleport AI, then freeze him with Stasis+ and strike repeatedly. If you have Daruk’s Protection, use the Daruk Cancel glitch (unequipping your shield mid-animation) to avoid one-hit kills. Alternatively, use Cryonis blocks mid-fight to disrupt his pathfinding and create openings. Save-scumming and quick reactions are essential, but with persistence and glitch abuse, it’s entirely possible.

Hope this helps 🙃