Long fics with interesting magic?

Hi all, long-time lurker - first-time poster.

I'm in desperate need of new recommendations to read and my hunting skills are coming up short sadly. I feel like I've been browsing forever for similar feeling stories for a long while.

Some of my utter faves (I've read them 3-5 times each, and love them every time):

Dark Heritage by Drops_of_Nightshade - Harry/Tom (eventual - it hasn't really made it in yet) 796K Ongoing
I ADORE this fic, something about it just tickles my brain in all the right ways. Rescued from the Dursley's Harry. The eventual Powerful Harry (he's still training but you just know he's going to kick some ass in future). The wand lore (addicted to the ritual of creating a wand). DURMSTRANG (the absolute best I've read in terms of fleshing out the school, houses, SORTING ugh I love). The magic itself is written in such a dynamic way. I can't sing the praises high enough for this one. It's sadly still ongoing and on somewhat of a hiatus but I'm hoping with everything I've got that it continues.

The Contract by DebsTheSlytherinSnapeFan - Harry/Rabastan 872K Ongoing
Lotta love for this one also, wickedly smart (Ravenclaw) Harry - saves himself with a betrothal contract. Kinda squicked me out when I first read the premise but grew to love it. Harry's relationship with Corvus as a father figure is so sweet. I really enjoy the relationships in this one and the trips abroad looking at other magical communities. Ongoing still

Lily's Boy by SomewheresSword Harry/Draco 746k Complete
One of my original loves, I've read this one easily 6+ times. Harry saves himself in 3rd Year after finding out about compulsions on him. A tiny bit tropey with Heir to a million houses but when it's well done I could care less, as is the case here. Raised by Sirius, Remus and Snape, I adore it. Founders magic, sentient Hogwarts. Love.

The Heir to the House of Prince by elph13 Harry/Theo 1.3M (3 parts - third part ongoing)
Another one of my adore-tier fics. Beautiful stuff all round. It's hard to sum up in a short little blip why I love it so, it's beautifully written. Powerful (to the next level) Harry. Luna being Luna. The relationship between Harry and Theo, their common history. KREACHER god I have to love this version of Kreacher the most of any fic I've read. Well worth a read, bonus Magnus Bane.

I'd love to hear if you know of a fic that I can sink my teeth into next. I know it's a big ask looking for longer works (Anything 150k-200k+, I weirdly need time to get into a story but I will consider anything if the story is good). If it wasn't obvious I'm big into that GayShitTM so would prefer Slash pairings but again, beggars cannot be choosers here. Not fussed on ratings.

Drarry is my fave. Interesting magic is a big one for me more than anything. Love Wand lore. If I was actually a talented writer I would start my own work but I'm too full of shame to put anything out there.

TLDR: Need long fics to consume with a passion, gay pairings preferred, cool magic a must.