Talk:The Lunar Eclipser/@comment-73.85.200.130-20161210222917/@comment-28089742-20161211031629

Inside the stage info box, for the "Battle" first column (numbering), you can see that there's the "Card Icon" for certain battle (i.e Battle 7 and 10 for Nightmare). The card icon indicate that after you defeated them, it's a GUARANTEE drop (you can point at it for info), so you don't need to worry about wasting stamina for a no-loot battle    ;)

For EVERY boss battle that comes back or newly introduced, it is a GUARANTEE drop as long as you're able to clear them.