Thanks to storing his memories within Rimuru, Veldora is functionally immortal. So long as Rimuru lives, Veldora can be summoned again regardless of how much damage he takes.

What episode does Veldora tempest come back?

Episode 37 of Reincarnated as a Slime sees Veldora the storm dragon reborn in human form, and he's remarkably similar to Dragon Ball's Super Saiyans.

Is Veldora Tempest released?

The reappearance of Storm Dragon Veldora: Veldora was released by Rimuru after unsealing the Endless Prison. Conference between Tempest, the human countries and the Dwarf Kingdom: establishment of alliances and cooperation.