Spoilers for magic items in Rime of the Frostmaiden.
As written, Rime of the Frostmaiden includes a typical number of magic items, but only one useful magic weapon, a +2 trident. That count excludes the Berserker Axe, which attaches a harsh curse, and 6 laser rifles, which I don’t count as magic. Some players will relish letting their rogues and rangers become raygun-blasting snipers, but many players, including those with greatsword-wielding barbarians, may not fancy where a laser rifle steers their character.
Dunegon masters can change the adventure’s loot to fit their players, and you, I, and the designers all know it. Surely though, the lack of magic weapons comes by design, from a choice the authors made because they felt it enhanced the adventure.
What motivated this choice?
The stinginess reinforces the scarcity and struggle that sets the adventure’s early tone. ThinkDM writes, “It’s meant to convey desolation at the surface level of Icewind Dale, literally and figuratively. This sets a contrast to the high magic stuff happening later in the adventure.”
The adventure mainly avoids granting magic items that only suit a particular class or character, favoring wondrous items, protective items, and even a wand of magic missiles that any character can use. This avoids the awkward moment when the party finds a +2 longsword even though everyone wants a rapier. (DM hint: When you announce the find to that party, pronounce “longsword” as “rapier.”)
D&D’s fifth edition design aims to play fine without magic items, but a lack of magic weapons weakens fighters, rangers, and rogues against creatures resistant to bludgeoning, piercing, and slashing from non-magical attacks. Every character suffers moments like when the fireball-blasting sorcerer enters the forge of salamanders. However, the game makes creatures resistant to non-magic weapons common enough to lead the designers to give monks and druids fist and claw attacks that count as magic. The D&D Adventurers League gives out magic weapons to any fifth-level character who wants one. This avoids both penalizing the classes that need them and the awkward moments when a group finds the wrong type of magic sword.
In Frostmaiden, a certain infestation of vampires could overwhelm a party without magic weapons. At best, that barbarian spends a night feeling ineffective. Hope you found a laser rifle.