When this card is revealed by your The Grandwalker Horus' Grand Skill, it can be summoned by paying one cost.
[LV1][LV2] When "Winged Beast" Spirits/Ultimates you control would be destroyed/depleted by opposing effects, you can put one core from your "The Grandwalker Horus" to each of those Spirits/Ultimates. Spirits which had core put on them by this effect remain on the field, on the same condition.
Ruling: When your "Winged Beast" Ultimate is destroyed/depleted, you can put one core from the Void to that Ultimate. However, that Ultimate doesn't stay on field.