Rupees and Rare Card
Enter the case sensitive referal code bzj60846 or khi00338 when you start the game to get 100,000 Rupees and an exclusive rare card.
Free Card & 100000 rubies
If you enter after start it will give you a rare card and money to start.
Code = juu06844
After you start you can get 100000 rupies for free and a rare card by just typing in dua 31463 at the end of the tutorial as a referral!
If you invest points into stamina, you'll be able to fight longer and gain new fighting options.
At the start it's best to keep adding points into stamina until you're around level 50 (or have approximately 100 stamina), then focus on defense.
The Cure Waters and Holy Powders that you receive at the beginning of the game are far more useful at higher levels than they are when you first start out.
There are three different alignments and each one has it's own better sides ie. Demons receive a bonus to attack damage, Man is a more defensively orientated alignment, while God takes a balanced approach between the two.