Natrix

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New players usually have the most problem with this boss early on. The main mechanic here is Natrix putting 20 shields on himself which have to be removed quickly in order to even damage him. Without specific units it might be particularly difficult for some players. To remove shields you want to focus mostly on high ASPD and Multi-Hit units.
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*Front
**Elpaiton : Hits twice, has 7 shields and 30% Knockback reduction. Stack ASPD on him. 
**Heidi : Dies faster than Elpaiton with just 5 shields.
*Damage Dealers
**Sylar, Hecate, Seyona
**Roromo: Requires specific setup. Has 2 lives.
*Support
**Kino : ASPD, Crit% and PAtk buffs.
**Elim : 3xMulti-Hit with higher than average ASPD. Damage is bad, but she helps removes shields faster.
**Patis : 5xMulti-Hit, more than Elim. Also contributes much more in terms of damage. Great choice. 
**Iliana : Her spear makes 10 attacks per second. Best choice. 
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Setup 1	{Front}	{2xDamage}	Kino	Elim/Patis
 	 	 	 	
 	 	 	 	
Setup 2	{Front}	{3xDamage}	Kino	
Kino will in general be better than adding a 4th Damage Dealer, due to her ASPD buff.
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This may sound ridiculous, but Elise can actually be used against Natrix. It's not easy, however. You need the Hands item from a previous event. The item increases ASPD and Attack Range.
Basically, Elise has a self-knockback attached to her main skill. With enough ASPD and Range, she forms a pattern with Natrix where she knocks herself out of its range just when Natrix attacks. 
To do this, you need an Elpaiton with no extra range (otherwise it would endanger Elise). 
You need Elise's ASPD around 0.75+0.32 upto 0.75+0.37 or so for this to work and Attack Range around 90+21. This can be done with 3 Hands, which each give ASPD 11% and Attack Range +8% at +10. So 3-4 Hand of Corruption+10 should be enough for this strat to work.
Benefit: Well, obviously, she takes out 4 shields per main attack, and has such high ASPD, that she takes out his shields so much faster than Archers like Patis or Elim.
If you use her, you can have a team setup like: Wedding Lin, Sylar, Sylar, Elise, Elpaiton.