More like Castle War!

anchored on:fantasyportal fantasytransported to another worldsecondary worldadventurelighthearted

but

Narrow

SpellsingerSeries
series9 books1983
Adventurous in tone, about quests and music.
“Alan Dean Foster's Spellsinger series follows Jon-Tom, a UCLA law student pulled into a fantasy world by the wizard Clothahump, where he discovers he can cast spells by singing along with his guitar.”
from the catalogue
Start with Spellsinger →
Spearwielder's TalesSeries
series3 books1993
Epic fantasy, adventurous in tone, about dragons and quests.
“The Woods Out Back, The Dragon's Dagger, and Dragonslayer's Return follow Gary as he's pulled back into that world again and again, growing into the role thrust on him.”
from the catalogue
Start with The Woods Out Back →
Quag KeepSeries
series2 books1978
completed
Adventurous in tone, about quests.
“Andre Norton's Quag Keep holds a notable place in gaming history as the first novel set in Gary Gygax's World of Greyhawk, written after Norton took part in an actual Dungeons & Dragons session with Gygax himself.”
from the catalogue
Start with Quag Keep →
AlmuricSeries
series1 book1964
Adventurous in tone, about survival.
Start with Almuric →
The Barbed CoilNovel
J. V. Jonesstandalone novel1997
Romantasy, adventurous in tone, about quests.
Dot and Tot of MerrylandNovel
L. Frank Baumstandalone novel1901
Whimsical in tone, about quests, set in otherworld.
“After Baum wrote The Wonderful Wizard of Oz, he wrote this story about the adventures of a little girl named Dot and a little boy named Tot in a land reached by floating on a river that flowed through a tunnel.”
from the catalogue