Which comes first, trashing the top card of my opponent's security stack from this card's inherited effect or the security check from the ＜Piercing＞ effect?

This card’s inherited effect activates first. After trashing the top card of your opponent's security stack, perform the security check for ＜Piercing＞.

Lamortmon rulings (BT13-055)

1 official ruling from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Effect: [Hand] [Main] If you have a [Ruli Tsukiyono] in play, by placing 1 [SymbareAngoramon] from your hand under 1 of your [Angoramon] as its bottom digivolution card, digivolve that Digimon into this card for a digivolution cost of 3, ignoring this card's digivolution requirements.
Inherited effect: [Your Turn] [Once Per Turn] When this Digimon deletes an opponent's Digimon in battle, trash the top card of your opponent's security stack.

Official Q&A

Which comes first, trashing the top card of my opponent's security stack from this card's inherited effect or the security check from the ＜Piercing＞ effect?
This card’s inherited effect activates first. After trashing the top card of your opponent's security stack, perform the security check for ＜Piercing＞.
Ruled Mar 28, 2024

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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.

Lamortmon rulings (BT13-055)

1 official ruling from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Effect: [Hand] [Main] If you have a [Ruli Tsukiyono] in play, by placing 1 [SymbareAngoramon] from your hand under 1 of your [Angoramon] as its bottom digivolution card, digivolve that Digimon into this card for a digivolution cost of 3, ignoring this card's digivolution requirements.
Inherited effect: [Your Turn] [Once Per Turn] When this Digimon deletes an opponent's Digimon in battle, trash the top card of your opponent's security stack.

Official Q&A

Which comes first, trashing the top card of my opponent's security stack from this card's inherited effect or the security check from the ＜Piercing＞ effect?
This card’s inherited effect activates first. After trashing the top card of your opponent's security stack, perform the security check for ＜Piercing＞.
Ruled Mar 28, 2024

Got a line that uses Lamortmon? Map it in the builder and share it with a link.