If you use Aurora's end of turn effect to play Deadbloom, win the showdown, and conquer Targon's Peak, do you ready 2 runes from Targon's Peak since you're already in end of turn?

Ruling: No, you do not ready 2 runes from Targon's Peak. Once the Ending Step begins, all "at end of turn" triggers that are currently active go on the chain at that moment. After this point, no more "at end of turn" triggers can trigger for the rest of that turn.

Sequence:

• At the Ending Step (317.1.a), all current "at end of turn" triggers go on the chain (Aurora's delayed ability in this case)
• Aurora resolves, playing Deadbloom and staging combat
• If you win the showdown and conquer Targon's Peak, its "at end of turn" trigger becomes active
• However, the window for "at end of turn" triggers has already passed for this turn
• Targon's Peak never "saw" the start of the Ending Step, only became active after that moment

Nuances:

• This is consistent with how phase-based triggers work in all other phases
• Phase-based triggers occur precisely when you hit the step specified in the rules, not a moment after
• The Ending Step happens once per turn, and all relevant triggers must be present at that exact moment to trigger