Adding to the Shadowpact comparisons, I'm pretty sure Chimp is using Nightmaster's sword.
EDIT: Also, to be clear, the reason I linked the Meso-American/Spaniard mythology to Chimp is because the Fountain of Youth isn't actually part of any mythology, but idiot Spaniards misunderstanding , similar to El Dorado. To attach it to an actual Native Floridian character would be worse, IMO.