The Undertow Vigor is a liquid-based power-up with a swirling, aqueous appearance, encapsulated in an ornate Art Deco glass bottle. The bottle features symmetrical, geometric patterns with metallic accents, reflecting the steampunk aesthetic. The liquid inside is a vibrant, luminous blue with a viscous, flowing texture, suggesting both the fluidity of water and the contained energy of the Vigor. The bottle's stopper is designed with intricate engravings, resembling waves or currents, enhancing its thematic connection to water manipulation.