After the first war 1000 years ago, Yhwach was sealed away, it

Could Genryūsai Shigekuni Yamamoto win against the real Yhwach if he was fresh from the start, have both of his arms, and without Yhwach's Medallion (Bankai stealing device)? - Quora

4 Reasons Why Yamamoto Didn't Kill Yhwach -Dafunda.com

The Memoirs of a Bleach Zealot: Bleach Fantasy II Round 22: Yhwach vs. Promathia

Yhwach, Bleach Wiki

Bleach: Thousand-Year Blood War: Bleach: Thousand-Year Blood War episode 7: Original Gotei 13 gets anime-original scene, Yhwach hints at Ichigo's lineage

Ol' Man Zangetsu is Juha Bach (Yhwach) from 1000 years ago! – Bleach 540

How did Yhwach ended up to be just sealed for a thousand year by this? Will this be explained later? : r/bleach

Could Genryūsai Shigekuni Yamamoto win against the real Yhwach if he was fresh from the start, have both of his arms, and without Yhwach's Medallion (Bankai stealing device)? - Quora

The Memoirs of a Bleach Zealot: Bleach Fantasy Round 14: Yhwach vs. Sephiroth (The Ultimate Evil Pt. 1)

Did Aizen have prior knowledge about Yhwach before the Quincy Invasion? - Quora

Yhwach, Bleach Wiki

Did Ichigo lose his powers at the end of Bleach? - Quora

Yhwach Villains+BreezeWiki