I've been playing this fantastic game for about 10 hours already and I am already discovering certain things that i wish I knew at the start of the game. I've actually restarted the game because of the things I did "wrong" even though there isn't really any way to do this game incorrectly. That's kind of the idea behind it being open world actually, you can go through it however you see fit. But there are certain things that once I discovered them I wish I had known from the start.
Do NOT play on "easy" mode
I am a casual gamer even though basically all of my content is gaming related. I don't devote a great deal of time to mastering a game and any of the souls-like games out there that exist do not interest me in the slightest. I am simply not good enough to perform well in those games and I lack the patience necessary to master them.
That being said: The "easy" setting on Immortals is entirely too easy. It is absurdly easy and poses little in the way of challenge. In the first 5 hours of play I easily dispatched all in my way and this includes inside of areas that I later found out were meant to be "too difficult" for me to enter. This is the way that the game kind of tries to force you on some semblance of a path yet on "easy" I was able to wander in these sections anyway.
Play the game on normal setting, you'll thank me later.
Get "the bird" as soon as you can
There is a quest that you are going to be offered very early on that says something along the lines of "investigate the crashed bird" ... Sorry I don't remember exactly what it says but it will be evident. I think that for most people that when this happens the distance that the crashed bird has from your location once the quest is offered to you is going to encourage you to save it for later. Do not save it for later, do it right away.
The bird is named Phosphor and once you acquire it gameplay in fighting changes immensely, especially once you power the bird up to have an AOE attack.
Phosphor's attack doesn't do any huge amount of damage or anything but that isn't really the point. When you are attacked by a bunch of enemies at once it can be a bit annoying attempting to focus on all of them at the same time. Phosphor can be called in and will strike thrice with an attack that never misses and once powered up, he/she/it will damage all the enemies in a certain area. The cooldown on this attack is remarkably short, and it consumes stamina to use it. Consuming stamina can be problematic but as you can see above, a stamina orb will drop on every hit and these are very easy to retrieve since Phosphor's attack also momentarily stuns all enemies in the vicinity. It can be seen as a cheesy way to win fights and it kind of is. However, this has made fights with even legendary opponents much easier and it really changes combat entirely.
Personally I just like having a combat partner anyway even if they don't do much damage. The fact that Phosphor stuns all enemies in an area can open up a lot of opportunities for additional strikes as well.
Focus on collecting ambrosia and completing Tartarus Vaults
Once you have scanned an area there are going to be a lot of options available to you and it's up to you in what order you decide to tackle them. I recommend getting to as much ambrosia as you can because this will power up your health which is obviously important. The Tartarus Vaults contain a wide variety of things but all of the ones I have been in have a Zeus Lightning reward and this will power up stamina, which is a very important part of the game.
The Tartarus Vaults are also a nice break from the outside world since for the most part they focus on puzzles rather than combat. It's a great way to take a break from the trigger happy outside world and I think it is wonderful that they included this in the game. The vaults would be boring if they were just a darker version of what exists outside of them and I am very happy that they did it this way.
Once you power up your stamina and health, fights are a lot easier as you would expect.
Power up slow arrow control
I'll admit that I like ranged combat in all games, so this might be more of a personal preference than it is something everyone can do. What is great about the slow arrow control is that once you get it, you can quite easily take out multiple opponents before the rest of their group is even capable of reaching you. There are also certain puzzles that cannot be solved without this power, so it is a rather important part of the game. The attack itself doesn't do very much damage but I'm pretty sure that this is by design. If it did do huge amounts of damage you would be able to kite almost every enemy in the game.
Slow arrow control also makes quick work of the Harpies, which are IMO the most annoying enemies in the game since they fly and seem to stay out of range of most of your other attacks.
In the end there is no right or wrong way to play this game by design. If you want to skip all the powerups and just head through the main quest that is your option and I am sure there are some hardcore gamers out there that are majestically good at parrying that have done precisely that. For us normal players though, we want to have a bit of an edge on our computer-controlled opponents. If you follow the above advice, I think it will make your experience in Immortals a lot more rewarding.
Even if you don't employ these tactics I highly suggest you check this game out anyway, because it is absolutely fantastic. If you are a PS-Plus member it is already included with your membership anyway!