I really can’t recommend these companion guides enough! New and revamped ideas have helped flesh out the story and any under-developed areas of the Undermountain and Skullport have been rectified, adding more substance and enjoyment in my games.
The guides bring in a whole new meaning for ‘Mad’ in ‘The Mad Mage’, lending Halaster to a Game show host friend and foe to the Player characters. The source material, these guides and the already established lore on Halaster really bring together a NPC that could be played both as an antagonist or a sympathetic reluctant enemy. I was initially worried the "Meta antagonist" would wear thin on my players but so far they've loved him and his zany/insane act.
The bundles especially really are a must buy for any DM currently running or intending to run DotMM. My group are currently (Without spoilers) messing around on the 6th floor, intending to return to Skullport to take on a notable foe that they semi-dealt with in Dragon Heist but in the mean time I’ve been familiarising myself with the lower floors, attempting to weave in smaller aspects as small foreshadowing. I can’t wait until the 10th level is released even though it’ll be some time until my group has made it there.