5 That whilom was to me too dearly dear.

That > [He who] whilom > formerly dearly > dearly (in the modern sense); grievously

6 O what of gods then boots it to be born,

boots > avails

7 If old Aveugle's sons so evil hear?

Aveugle > "Blind", "Blind-man" (French word. He is the son of Nox and the father of Sansfoy, Sansloy, and Sansjoy) so evil hear > such evil is heard [If of old Aveugle's sons such evil is heard, made public: Latin audire male]

8 Or who shall not great Night's children scorn, 9 When two of three her nephews are so foul forlorn?

three her nephews > her three grandsons forlorn > ruined [by the Redcross Knight]; deserted, abandoned [by their grandmother]

105.24

Vp then, vp dreary Dame, of darknesse Queene,
2 Go gather vp the reliques of thy race,
Or else goe them auenge, and let be seene,
4 That dreaded Night in brightest day hath place,
And can the children of faire light deface.
6 Her feeling speeches some compassion moued
In hart, and chaunge in that great mothers face:
8 Yet pittie in her hart was neuer proued
Till then: +for+ euermore she hated, neuer loued.