I.down1[美 daʊn, 英 daʊn]副down often appears as the second element of certain verb structures in English (back down, clamp down, tone down, etc). For translations, see the relevant verb entry (back, clamp, tone, etc).
Whosoever claimed and absorbed the powers of all three books could either contain that power and rule, or call down armageddon and recreate the universe in their own image.