this is a first Named Eras on furaffinity alongside Rogen and Azumaku project have eras.
my friends on discord server told me if there is a era. here what I got here!

Regular era

This era including a release soundtrack and new character on the next Soundtrack

Dilao Chengbao Era (地牢城堡 Dungeon Castle) (Final Bosses)

1. 魔鬼争理论 ~ Zealous of Determine Fighting (not finished) (info finished)
2. 魔鬼垢嘗式 ~ Beware of Cesspool Crawlers (not finished) (info finished)
3. 魔鬼法旅行 ~ Organization Alternation (not finished) (info finished)
4. 魔鬼黑禅师 ~ Mysterious Black Monk (not finished) (info in progress)
5. 魔鬼哥布牢 ~ Badly Treasure in the Gale Dungeons (not finished) (info not finished)
5.5 魔鬼骷髏王 ~ Shelter Demise of All Mysticism skeleton (not finished) (info not finished)

Future era

This era is a future which is new oc and original soundtrack etc would it Remake track before was released next Soundtrack

Yaosai chuanshuo Era (要塞传说 Forth Legend) (Final Bosses)

6. 魔鬼萎民间 ~ Rulers of Folklore Languishing
6.5 魔鬼主迟钝 ~ Unbearable Barbarity Beast
7. 魔鬼阴影图 ~ Jealousy Shadowing Figured
8. 魔鬼最传奇 ~ Forth Leaders of Final Legendary
9. 魔鬼伟父亲 ~ Missing Family of ???
10. 魔鬼怀疑煚 ~ Horribleness in Lostness Distrustful

Jueyi huanxiang Era (决议幻想 Resolution Fantasy) (Final Bosses)

11. 魔鬼庙嫉妒 ~ Narrowest Sonaria
12. 魔鬼兽奇幻 ~ Lunation in the Beast Persona
13. 魔鬼胭脂宝座 ~ Approximate of King Palace
14. 魔鬼海洋生物 ~ Marine Life of Swirler
15. 魔鬼缺小脑 ~ Nurarihyon's brainpower

Shensheng de si Era (神圣的死 Sacred Death) (Final Bosses)

16.
17.
18.
19.
(Last) 20.



if you want to see touhou fanmade and doubutsu timeline. I'll link into information
Touhou fanmade: https://www.furaffinity.net/journal/10081113/
Doubutsu Project: https://www.furaffinity.net/journal/9547228/