#Interaction between Therion "Lily" and Des Dendle.
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Card Text
Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to your "Vampiric Orchis" as an Equip Spell Card, OR unequip the Union equipment and Special Summon this card in face-up Attack Position. While equipped to a monster by this card's effect, each time the equipped monster destroys 1 of your opponent's monsters, Special Summon 1 "Wicked Plant Token" (Plant-Type/EARTH/Level 1/ATK 800/DEF 800). (1 monster can only be equipped with 1 Union Monster at a time. If the equipped monster is destroyed as a result of battle, destroy this card instead.)
TCG: Unlimited 
OCG: Unlimited 
TCG: 2003-10-10
OCG: 2002-07-18
Common
Card Text
You can only use each of the following effects of "Therion "Lily" Borea" once per turn.
● You can target 1 "Therion" monster or 1 Plant monster in your GY; Special Summon this card from your hand, and if you do, equip that monster to this card.
● You can send 1 card from your hand or field to the GY; add 1 "Therion" Spell/Trap from your Deck to your hand.
A "Therion" monster equipped with this card gains 700 ATK, also it can activate the 2nd effect listed above as if it were "Therion "Lily" Borea".
Therion
TCG: Unlimited 
OCG: Unlimited 
TCG: 2022-05-19
OCG: 2022-01-15
Prismatic Secret Rare, Secret Rare
well doesn’t it have to be equipped to vampiric orchis to be counted as equip but yeh it makes sense you can ss
I would say you cannot use its effect to unequip and SS, as its not considered a Union equipment, as it was not equipped by its own Union effect. Lily would also not gain the bonuses of summoning a token from having Des Dendle, as Des Dendle was not equipped by its own effect
As for A - Assault Core, it does have different wording
Which is why that monster can SS itself
then, whats the difference between this case and the case between Cyberdark Horn and Destruction sword?
Des Dendle is a union monster, and its effects are applied when equipped as a Union equipment, not just as an equip spell card
Card Text
If this card is Normal Summoned: Target 1 Level 3 or lower Dragon monster in your GY; equip that Dragon monster to this card. Gains ATK equal to the original ATK of the monster equipped to it by this effect. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card would be destroyed by battle, destroy the monster equipped to it by its effect, instead.
Cyberdark
TCG: Unlimited 
OCG: Unlimited 
TCG: 2006-11-15
OCG: 2006-08-10
Common, Duel Terminal Normal Parallel Rare, Super Rare, Ultimate Rare
Card Text
You can target 1 "Buster Blader" you control; equip this monster from your hand or your side of the field to that target. While this card is equipped to a monster, your opponent cannot Special Summon monsters from the Extra Deck. While this card is equipped to a monster: You can Special Summon this equipped card. You can only use this effect of "Dragon Buster Destruction Sword" once per turn.
Destruction Sword
TCG: Unlimited 
OCG: Unlimited 
TCG: 2016-01-14
OCG: 2015-10-17
Common, Ultra Rare
oh nevermind, I get it now
must be equiped by its effect first correct?@viscid pendant
As far as I know, yes
Newer union monsters can detach and SS themselves without specifically being a union equip, but des dendle does not have an errata to allow that, and as far as I know, theres no rulings specifically allowing it with Des Dendle
ok thank you so much
is there any yugioh data to explain more about these types of equip effects like Des Dendle?
Just so I can study it in more detail
Unfortunately theres not much development for union monsters, and Konami kinda forgot about them, but theres https://yugioh.fandom.com/wiki/Card_Rulings:Union_monster
For union monster rulings, and a blog post below for monsters treated as non-monsters: https://yugiohblog.konami.com/articles/?p=3558#:~:text=Monsters that are equipped turn,Monster cards in the Graveyard.
The following rulings apply to all Union Monsters. Delta Tri: You cannot activate the effect to equip a Union Monster if Delta Tri is already equipped with a Union Monster. Delta Tri: The effects...
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thank you friend