This Seven Knights 2 aims to provide a comprehensive overview for beginners, including Resources, Heroes, Rubies & Stores, most of the information is based on and translated from Korean Server player Zephyrus (randytony) from his experience from the Korean Meta & the current Global meta.
TL;DR
Push the Main Quest Line as far and as quick as you can, the further you go, the more resources you’ll be able to accumulate, along with the quality increase of the drops from the 4/8 Raids.
Resources
You can check your current Main Quest progress by clicking on the Current Main Quest as demonstrated

You can then check the current difficulty level

There are several different sources of resources in Seven Knights 2
Field Exploration
The different regions become available as you complete different Main Quest Chapters

The rewards get better as the difficulty level increase.
Dungeons

The more difficult the dungeon, the more drops they provide.
Soulstone
The higher the difficulty of the dungeon, the higher the quality of the Soulstone, grade 10 is the highest difficulty available in Global meta at the moment which drops 40 red Soulstones that can be used to exchange for 2 Legendary hero fragments.
Potion
There are 3 grades of potions: gray, green & blue, you need to use all 3 for your hero to fully unlock their potential
Dungeons below 5 – gray/green potions
Dungeons between 5~8 – green/blue potions
Dungeons between 9-10 – blue potions
Clear grade 10 Dungeons when you need blue potions, Dungeon 8 when you need green potions or below
Rune
Runes are divided in 3 grades too.
4-Player Raid

8-Player Raid

The Raids are the primary source of your gear and accessories
Hero Selection Ticket
You’ll be given a Rare/Rare+ Hero Selection Ticket after completing level 1 of the Celestial Tower, and another 3 tickets if you make any deposits into the game. Our recommendations are the following, listed in the order of priority:
1. Shay

Shay definitely outshines her grade in PVE, can probably be rated as S+, and it’s all because of her Ultimate & Passive, the skills effects increases as you level up.
This is her Ultimate skill effect at level 56

It can increase her party’s Ultimate gauge by 75%! that means she can almost instantly reset her party’s Ultimates when she uses hers.
2. Lukey

Again, his Ultimate which can increase the party’s ATK SPD & MOV SPD is the key here, at max level, they are increased by 73.8%! The faster you attack, the faster you fill up your Ultimate gauge.

3. Selena

Again Her Ultimate which decreases allies’ cooldowns is critical here, at max level, it will decrease them by 48 seconds

This basically resets their skills/
If you use all 3 of them, you can almost cast continuously non-stop.
4. Last Ticket Selection
The choice is more open for 4th spot,
- Rare+ Henry
- Rare+ Lene
- The other Rare+
Rubies
In this section, we’ll discuss what you can and should use your Rubies for.
Coming Soon
Store
In this section, we’ll discuss what you should buy from the different stores.
Coming Soon
Original Author: Zephyrus (randytony)
Original Source:【心得】韓版玩家稍微聊一下這遊戲&常見的新手問題跟方向
Translated & Edited by: Simvaio