I imagined so. Anyway, suppose I'll upgrade my health, stamina, and skill. Maybe strength. Thanks, guys.
I feel like reading some Lovecraft as well.
The more you level up, the more they're useful to keep in bunches... so if you're close enough to getting that extra level but are short 1000, 3000, 5000 echoes, you can just pop a few cold/thick/whatever blood and then spend your echoes before you head back into the fray. Especially before you're about to take on a boss...
Also works well for when you need a few echoes for anything, really, not just leveling. (Out of bullets/blood/whatever, unlock a new weapon, need a few souls to upgrade your weapon, etc.)
They're the functional equivalent of the usable items that grant you specific amounts of souls in the Dark Souls series (old proud soul, old knight soul, etc.).
The naming convention takes some getting used to though.