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Heart Astro Knight is a costume in the Poptropica Store and can be bought for 75 credits, It is an Astro Knight with a darkish pink armour, a pink cape, a pink heart on the breastplate, a pink plume coming out of the helmet, a pink visor and a sword with a pink hilt.
- Like many of the sword-related costumes, players can use the sword in Legendary Swords.
- It is the female counterpart of the Earth Astro-Knight and accompanies the Dark Astro-Knight.
- In the Poptropica app, it can be bought for $0.99 in the "Knights Pack", which also includes the Templar Knight and Lightning Knight costumes.