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And still they are not aware what powers lie between their hands!

Powers are plural. The third person plural ('they') of the verb 'to lie' is lie.

Past tense would be lay

And still they were not aware what powers lay between their hands!

Present:
Singular: I lie, you lie, he/she/it lies
Plural: We lie, you lie, they lie

Past tense is all 'lay'.