You probably find expired promo codes. I don't know if there's been one in the last 2 months other than Ronda's promo code. 

The only active one right now is RAIDRONDA. There's been some other more time sensitive ones, but the aforementioned code is the only active one.

Thank you guys. I will see when a new one pops up if it will work.

Appreciate the response

Bro, we watch there there 

Hey Yall i am new here. how do i get these promo codes. Please.

Retired Navy 

HellHades lists codes here:

https://hellhades.com/raid-shadow-legends-promo-codes/

If you are a new player then one of the new player codes should work, but you may not be able to use more than one. "Powerstarter" might be the best early game one to use, but if you're looking to the long term then "Mordecai" [iOS and Android only] may be better (and as a new player myself I stand to be corrected!).

Otherwise, the only active code for normal players at present is "Raidronda", which you can input using the left-hand menu on the Bastion home screen in the game, under the News section.

Looks like a new one, via Reddit:

RAIDHOLIDAY 

"Gives a few refills, a bit of silver, and some multi battles which all last for 6 days. "

Another new PromoCode for accounts newer than 72 hours old: CHRISTMAS2022

Is Mordecai still active for new players?

Another recent one still active is:

midgame23win 

Similar rewards to raidholiday.

This one says invalid.  

It was for me when I joined a month ago. However, I haven;t really been able to use him, and with hindsight I think I should have gone for the "Powerstarter" to get Talia, as at least I'd get some early game use from her, especially in Arena and Fire Knight, then just wait to pull Mordecai sometime before starting to hit spider 15, which could be a while!

Strange - I literally just used it this morning.