Sin is a secret angelic faction that you can play only if you edit your game files. It is a very OP faction that you will have no trouble conquering the entire continent as long as you keep a few things in mind.
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Make sure you keep your army casualties to minimum
Well it’s pretty much obvious right? I mean who actually enjoys losing his men? But it is especially important for angels to conserve their strengths even if they have to yield a few non essential territories to enemies. The thing is that, angels are only OP when their Lvls are high enough to make a full use of their special abilities. I believe angelic holy mages have to reach at least lvl 20 to gain an ability called “vanish”. This “vanish” skill is what makes angels so powerful . It has a decent range and very few enemies are resistant to holy type attacks. Also it can inflict serious aoe damage that can kill a large number of clustered enemies quickly. As long as you protect these mages with a sufficient number of angelic knights and chess soldiers, your army can defeat any enemy in this game without much effort.
Do not let your officers be killed in battle
It is a common sense right? As your officers survive multiple battles and gain more experience they can learn new and more powerful abilities that can make them an unstoppable force in battle. Angelic officers are delicate creatures that need your love and attention to grow more powerful over time. There is one officer, in particular, you must pay extra attention to ; Her name is Tycho. I say Tycho is the 2nd most powerful hero in the entire game for a good reason. She can wipe out an entire army from miles away with her nuke called “Judgement”. Judgement can be activated very quickly and its large blast radius can even hit moving targets. (as long as they are not moving too fast) Unfortunately, She must reach at least Lvl 40 to acquire this ability. So it is imperative that you need to feed her as many kills as possible to make a full use out of her.
Make use of terrain to slow down your enemies as much as possible
Although “vanish” is already powerful, you can kill your enemies more efficiently if their movement is severely hampered by terrains. Unlike other ranged attacks, both “vanish” and “Judgement” do not travel in a straight line. Its ray of destruction comes down from the heaven itself to punish mortals for their wicked deeds. So fast moving targets such as dragon knights won’t be affected as much as heavy melee infantries. Of course, if you encounter such fast moving targets you should intercept them with your angelic knights to keep them held down long enough for your mages to finish their work. Still, it never hurts to make use of terrain advantages as much as you can.
Be wary of long ranged units such as musketeers or archers
When I was playing as Sin, the only faction that managed to put up some resistance against my unstoppable angelic army was Musket. Normally, you will start your campaign right next to Musket so you will wipe them out long before they can grow too powerful . But if factions like Musket or Alfheim somehow manage to survive the initial onslaught, I recommend you to keep an eye on their powerful ranged units to make sure your holy mages don’t get sniped from distance.
Use aggressive strategies but fight defensively in battles
Well it’s more of a personal preference than an actual advice. I love crushing my enemies before they even have a chance to grow powerful. I also like bisecting enemy armies in two to cut off their escape routes and getting rid of enemy officers.It has worked out well so far no matter which faction i play. For battlefield tactics, I think fighting defensively is the best way to go for angels. Most of your kills will come from your angelic mages so it is very important to keep them protected at any cost. Even if you have to sacrifice a few knights or territories along the way, it is better to keep your veteran mages alive in the long run .