Synchro Monsters

Synchro Monsters are monster that have to be Special Summoned by tributing 1 Tuner and 1 or more non-Tuner monsters from yout side of the field. This is called Synchro Summoning.

-Red Dragon Archfiend:

lvl 8 Dark Synchro Dragon ATK 3000 DEF 2000 effect 1 tuner + 1 or more none tuner monsters. if this card attacks a defense position monster your opponent controls, destroy all defense position monsters your opponent controls after damage calculation. during your end phase, destroy all other monsters you control that did not declare an attack this turn.
-Stardust Dragon:

lvl 8 Wind Synchro Dragon ATK 2500 DEF2000 Effect, 1 tuner + 1 or more none tuner monsters. You can Tribute this card to negate the activation of a Spell Card, Trap Card of Effect Monster's effect that destroys a card(s) on the field, and destroy that card. If you negate an effect this way, you can Special Summon this card from your Graveyard during your End Phase.
-Gaia Knight, The Force of Earth:

lvl 6 Earth Synchro Warrior ATK 2600 DEF 800 effect 1 tuner + 1 or more none tuner monsters.
-Junk Warrior:

lvl 5 Dark Synchro Warrior ATK 2300 DEF 1300 effect "Junk Synchron" + 1 or more none tuner monsters. When this card is Synchro Summoned, it gains ATK equal to the total ATK of all level 2 and lower monsters on the field.
-Colossal Fighter:

lvl 8 Dark Synchro Warrior ATK 2800 DEF 1000 effect, 1 tuner + 1 or more non-tuner monsters. This card gains 100 ATK for every Warrior-type monster in any Graveyard. When this card is destroyed by battle and sent to the graveyard, Special Summon 1 Warrior-monster from either players graveyard.