Thank you very much is also a way to also rapidly get HP ( health) ?
The black market merchant also sells an HP booster which gives you max hp at the end of each day, but there are some brutal boss fights that will require you to gain way more hp than the booster can give reasonably quickly however. Thoroughly explore the casino in order to get the other hp source that isn't locked behind a boss fight that makes final boss Valeria look like a chump.