Timeworn Dreambinder and 4-set interaction

Hello. I’m making a Druid alt and the Timeworn Dreambinder legendary looks good to me. It seems however that it doubles-down with the four-item set.

While in an Eclipse, the cost of Starsurge and Starfall is reduced by 15%.

Starsurge and Starfall reduce the cost of Starsurge and Starfall by 10% and increase their damage by 10% for 5 sec, stacking up to 2 times.

Is it calculated from the base cost of Starfall and Starsurge, or from the reduced one after one of these effects is in place?
Thank you all in advance.

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