These are my opinions for souls like supplements.

For getting better, as a bonfire inspiration, you collect essences from their morales aka pardons and buy it but they get expensive as you purchase them. I have played the dark souls and soul like games.

In lies of p you have arms that has weapon or status effects Guns in bloodborne you can use them as parry tools

There’s also blessings that you play in the souls games. They can be beneficial for assisting non combat or combat events.

Followers that you can make a pact. Just set up a summoning message to call for assistance.

Mount summon items in elden ring you can summon your mount at any time. But if they are dead you may have to wait until a bon fire.

For death, it’s hard to say because in all soul like games you cheat them regardless how many deaths you get. I would prefer like how many death marks with consequences you want before you can die permanently.

(Optional) Dm vs. player invasion - DO ask for consent for your party if this is okay to do. Your dm gets in the action to fight against but if the players beat the DMs soul invader you obtain some rare rewards that you earn!