Synergies

Synergies are a type of upgrade only available after certain upgrades have been chosen. Synergies were introduced in 20 Minutes Till Dawn and never existed in 10 Minutes Till Dawn. The icons of Synergies are distinguishable from regular upgrades by having red icons and an internal red border.
This is a list of all 12 synergies, along with their prerequisite upgrades.
Synergy 	Image	Description 	Prerequisites
Death Rounds 	 	Your bullets deal an additional 10 damage. 	
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Frost Fire 	 	When you inflict Freeze, also inflict Burn for 6 damage per second. 	
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Gun Mastery 	 	
*Bullet Damage +30%
*Fire Rate +15%
*Reload Rate +15%
* Max Ammo +1
*Piercing +1 	
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Mini Clip 	 	
*Reload Rate +75%
*Bullet Damage +50%
* Max Ammo -5 	
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Overload 	 	When Lightning strikes an enemy that is burning, create an explosion that deals 25 damage. 	
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Stand your Ground	 	
*Projectiles +2
*Fire Rate +25%
*Move Speed -25% 	
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Summon Mastery 	 	
*Summon Damage +35%
*Summon Attack Speed +35%
* Bullet Damage -35% 	
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*
Death Plague 	 	Enemies killed by Curse will spread Curse to nearby enemies. 	
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Generator 	 	When you gain ammo, also gain 35% Fire Rate for 2 seconds. 	
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Kunoichi 	 	Increase Fire Rate by 10% and Piercing by +1 every 10 seconds. This bonus is reset upon getting hit. 	
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Sword and Shield 	 	When Holy Shield is not active, kills with Smite lower the regeneration time of Holy Shield by 1 second.	
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Titan 	 	
* Max HP +2
* Move Speed +25%
* Character Size +25% 	
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