The Starchild Trilogy

From back cover Baen paperback March 1986:

THE REEFS OF SPACE

Far beyond all civilized planets, out of reach of the omniscient Plan of Man, a few brave explorers have found freedom... and the weapon they need to liberate Earth.

STARCHILD

Someone -- or something -- dares to threaten the Plan of Man. But whoever the Starchild is, he is not bluffing... for he can make the stars blink, and shut off the Sun.

ROGUE STAR

The awesome power of the Starchild is unleashed -- just in time to save all humankind from the deadly Rogue Stars.