Zombie head
Gem of aspiration was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
[FAQ] • [doc]
Gem of aspiration detail

Gems of aspiration are used to upgrade the Sunfury armour. Each gem can be consumed to add 500 sanctification points to the armour, also awarding the player with 1,000 Divination experience.

They can be obtained by combining solar flares, at the cost of 1,000 solar flares per gem of aspiration.

After upgrading the armour, leftover gems of aspiration become useless.

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