THE MAGIC MAY RETURN (1981) - edited by Larry Niven. These are stories set in the "Warlock" series of Larry Niven. A (mosty) original anthology - the lead Niven story was from Magazine of F&SF April 1969 / the other stories are new to the 1981 trade paperback.

"Not Long Before the End" by Larry Niven
"Earthshade" by Fred Saberhagen
"Manaspill" by Dean Ing
"'...But Fear Itself'" by Steven Barnes
"Strength" by Poul Anderson & Mildred Downey Broxon

MORE MAGIC (1984) - edited by Larry Niven. These are stories set in the "Warlock" series of Larry Niven. A (mosty) original anthology - the Niven stories are from Magazine of F&SF 1982, 1981 / the other stories are new to the 1984 trade paperback.

"The Lion in His Attic" by Larry Niven
"Shadow of Wings" by Bob Shaw
"Talisman" by Larry Niven & Dian Girard
"Mana from Heaven" by Roger Zelazny