DARK BLADE ARCHETYPE
Frontline Garrison
Field Spell
Once per turn: you can send 1 DARK Dragon Union monster from your deck to your GY, and if you do, special summon 1 monster from your hand or deck with the same name as monster sent by this effect. Monsters your opponent control become LIGHT attribute. Monsters you control that have Union monsters attached to them cannot be targeted by card effects.

Senryu
Level 5
DARK/Dragon/Union/Effect
1500 ATK 2000 DEF
Once per turn, you can either: Target 1 "Dark Blade" monster you control; equip this card to that target, OR: Unequip this card and Special Summon it. A monster equipped with this card gains 900 ATK and DEF, and you can tribute this card to target 1 monster your opponent controls; destroy it, also if the equipped monster would be destroyed by battle or card effect, destroy this card instead.

Pitch-Black Dragon
Level 3
DARK/Dragon/Union/Effect
You can special summon this card by banishing 1 Normal monster from your hand, field or GY. You can only Special summon "Pitch-Black Dragon" this way once per turn. Once per turn, you can either: Target 1 "Dark Blade" monster you control; equip this card to that target, OR: Unequip this card and Special Summon it. A monster equipped with this card gains 400 ATK and DEF, and you can tribute this card to add 1 DARK Dragon Union monster from your deck to your hand, also if the equipped monster would be destroyed by battle or card effect, destroy this card instead.