Basically the Heart of Tarrasque from Dota 2. Would be really cool to see some multi-universe interactions in Valve games.
Cost: 6300 souls
Description: Increases your health, health regeneration speed and damage.
Stats:
Health - +800
Health regen - +5/s
Bullet damage - +40
After entering the game with borderless window, then changing resolution and setting it to full screen and back to borderless window all of the other resolutions will be gone.
In tutorial while joining sandbox you probably want to test some stuff and to test some items, you need to you know, buy them, but in tutorial sandbox is not really a sandbox, because you have only 5k souls to spend.