The fourth era begins with the introduction of Yippy, the first new norn for many generations.

Yet another plague left only Yin and Zaph

Yin and Adel die from unknown causes. Both
old, eight hour aged  Zaph and Yippy begat Art. As Zaph is so old, he was artificially kept fertile using cobs and BORG.
Zeph was created posthumously from Yunti, Aklia was created posthumously to Zen and old Yippy.

Art grew to child stage at just twenty three minutes old! Eibell was adult at forty two minutes. Bulb was born to Yippy when she was 12h 15m old

Buffin almost slept herself to death. Though she and her mother seem to have no mutations. The unnamed purple norn was born and died without me being present, so I cloned it as Cayli. But Cayli wouldn’t eat and died.

Darcy, Eansi & Eibell were created at same time (Darcy was created later from their genetic father). Darcy was initially placed in wrong generation, leading to some norns with names out of alphabetic sync.

Art impregnated Dazy at 13 and a half hours old!! He died aged 15h 29m  with fourteen living descendants.

Filli and Fergus were killed by the same plague that killed Dazy and Eelia, but were later cloned.

Bulb died naturally aged 13h 8m.

Grizz is probably the most inbred norn I've ever known of, with his father, grandfather, great-grandfather and great-great-grandfather all being Bulb! This means he is probably nearly  identical to him genetically.