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

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

B1 [ I + adv/prep, L ]

present participle lying
past tense lay
past participle lain

If something lies in a particular place, position, or direction, it is in that place, position, or direction

Lie (Cambridge)
Lie (Collins)
English verb: to lie

Present tense: Singular: I lie, you lie, he/she/it lies. Plural: we lie, you lie, they lie.

Past tense: Singular: I lay, you lay, he/she/it lay. Plural: we lay, you lay, they lay.