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Earth Astro Knight is a costume in the Poptropica Store and can be bought for 75 credits, It is an Astro Knight with earth-brown armour, a green cape, a green leaf on the breastplate, a green plume coming out of the helmet, a green visor and a sword with a green hilt. It is Earth Day-themed as it came out just before Earth Day.
- You can use the sword in Legendary Swords.
- If you wear the cape, leaves will drop out of it as you move.
- Earth Astro-Knight has some colors of Sir Cador.
- The female counterpart is the Heart Astro Knight.
- It goes along with the Dark Astro Knight.