Eight sisters don't guard the essential hoof

This is from the game CreasureQuest, so I suspect the solution in context with the historical background (the lost treasure of the Flor de la Mar, Afonso de Albuquerque, etc).

I'm stuck here. If eight sisters don't, maybe one sister does? But what? And what could essential hoof stand for?

Any clues?


locked by Rubio Mar 19 at 17:04

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  • $\begingroup$ I'm not sure what the question is. Could you clarify what do you expect as an answer? $\endgroup$ – Chaotic Mar 19 at 15:18
  • $\begingroup$ This post has been locked, as it is taken from an ongoing contest. For more information see our policy on Questions from Ongoing Contests. $\endgroup$ – Rubio Mar 19 at 17:05