Board Thread:Fun and Games/@comment-26184570-20151031140014/@comment-25356210-20151031150117

Most of the Forerunners died. At the end, only one survived in a cyro chamber.

The rest of the races (Covanent and humans) were remade by the mantle of responsibility. (It preserves all races and creatures DNA)

The flood became a threat later because the dumb forerunners took some flood "specimens" instead of EXTERMINATING them once and for all.