Question about Ending B (Ender Lilies)

Is the Blighted Lord supposed to be such a pushover? I understand that there’s a whole other phase for Ending C, but I expected the B version to be somewhat challenging. I destroyed it first try without even breaking a sweat. I think I healed once? I was just taken aback by how easy it was, I don’t even think my build is that good. I have my spirits maxed and I made sure to collect every item, but that’s it. Is there a lore reason why it’s so weak?

Edit: Just beat the C version. What a disappointing final boss. Maybe I’m judging it too harshly because I beat Nine Sols before this, and its final boss is one of the best final bosses of all time imo. Idk, I’m just supremely underwhelmed. I really didn’t like how it just gives up at the end and lets you kill it. I was gearing up for an epic final encounter. That was just the last thing I expected it to be. What a bummer…