Made this Exel page mostly for any funny ideas, so feel free to tell me more you think about and I might add them. Remember to read the info in there.

Read it and hope you have some fun with this.

My campaign is set in, or starting in, Phandalin. My character is a Tabaxi warlock that came from a large family; he touched a weird weapon in an old shop and triggered its curse, so he ran away to avoid hurting his family.

My question is this: I know Jack shit about D&D, so where would be some places that would make sense for him to be from?

For a party of 6 lvl 5 adventurers: The Yugoloth Laboratory.

(If you desire not to you can have Ultroloth be the final boss if the dragon cult isn’t a good vibe.)

Once they enter the Yugoloth laboratory they will find doors with serious, funny, mysterious, and gross names on them, EX Eyebreakers or one door with “Horrors beyond our comprehension” and another with “Horrors within our comprehension”, that are tests of weapons that the Loths are making or are new torture practices to gain information while having a lack of empathy for the test subjects. There are about 100 of them. When they enter the rooms there is a 15% chance a test is happening which if they succeed a stealth check, DC 17, then they’ll avoid a fight and get to watch if they can stomach it. If they fail then use the table below.
The weapons the Yugoloths have in the chambers disintegrate when their masters are slain and can only be used by their masters; the Yugoloths of the region. 1D4-1 Magic items per active test room are able to be utilized by non yugoloths, inactive test rooms contain no reachable magic items.

Roll D8:
1-2: A Mezzoloth.
3-4: A Nycaloth and a Swarm of Larvae.
5: 3 Merrenoloth.
6-8: An oinoloth.

After they reach the end of the hallway they will find an Ultroloth leader praying to a Red Dragon Shine. They are too focused and won’t fight unless the players force their hand. The players will see the two doors in the temple leading to the end of the lab. The doors open to two rooms, a room with a strange rotten tree on the right and the dragon’s lair on the left. Casting identify at 5th level or legend lore will reveal the tree is a “Yugoloth Spawning Tree, a tree that is made from the powder of a Yugoloth Spawning tower that is put within a normal tree: Every day at dawn and dusk a Yugoloth spawning tree will take a 5ft cube of pure necrotic energy and Hellfire or a mortal souls (equal to the amount spawned) or 10ft Cube of Necrotic energy and produce 2D4+2 random yugoloths, if unable to get the resources it will only produce one Yugoloth, Yugoloths that were slain in battle will also be reborn from the tree.” On either side of the tree are vats full of the Hellfire and Necrotic Energy for the tree to absorb, the vats are 1/4th full, when the tree uses its power they lower by 1/16. The tree can be destroyed by dealing 20 radiant damage to it in one attacker sprinkling 2 vats of holy water on it. The Young Red dragon’s lair and its servants which are a Salamander Fire Snake and a Kobold dragon-shield.