I examined the Icespire Hold dungeon in the D&D 5e Essentials Kit. The Icespire Hold door(between H1 and H2) is not locked, but I think the PCs I DM for might think it is locked.
One of them is a sorcerer, and could possibly cast the knock spell on the door. Cryovain, the white dragon boss of the dungeon, is likely to be asleep at the time when they arrive. There are several noises that wake him up: ringing a bell, whispering in his ear, some spells (they only list thunderclap as one of the spells that would wake him up), etc. Would knock count as a spell that would wake Cryovain?

  • \$\begingroup\$ Is this title a spoiler and how would we avoid the spoiler if so? \$\endgroup\$ May 31, 2023 at 7:09
  • \$\begingroup\$ @FerventHippo Is it really that big of a spoiler, even? \$\endgroup\$ May 31, 2023 at 16:42
  • \$\begingroup\$ I have no idea as I haven't played the adventure. But from the title I can deduce that 1. a creature named Cryovain resides in a place named Icespire Hold, and 2. they are sleeping. Maybe your PCs are reading up on data structures for C# and see this in the "hot network questions", thus being spoiled about the contents of your adventure. Hence the related meta question. \$\endgroup\$ Jun 1, 2023 at 11:25
  • \$\begingroup\$ @FerventHippo Cryovain is a white dragon. At the point where the PCs go to Icespire Hold, they would already know where this is and that Cryovain lives at Icespire Hold. \$\endgroup\$ Jun 1, 2023 at 12:59
  • \$\begingroup\$ Maybe the adventurers are oblivious that large noises may cause them troubles. I'm nitpicking but I think the question is valid: is this detailed information needed in the title for the question to make sense? Would "what is the effect of using the Knock spell on the front door of Icespire Hold" work? \$\endgroup\$ Jun 1, 2023 at 13:59

1 Answer 1


Knock and thunderwave have similar volume.

The adventure states:

Someone or something makes a noise loud enough to interrupt the dragon’s slumber. Noises that qualify include the clap of a thunderwave spell

Thunderwave states:

the spell emits a thunderous boom audible out to 300 feet.

Knock similarly states:

When you cast the spell, a loud knock, audible from as far away as 300 feet, emanates from the target object.

So knock and thunderwave have similar volumes, as they’re audible from the same distance. Ergo, if thunderwave awakens the dragon, so does knock.

It should be noted that while you mentioned thunderclap in the question, the adventure mentions thunderwave, and thunderclap is not as loud as knock or thunderwave:

You create a burst of thunderous sound that can be heard up to 100 feet away.

The DM determines from where it is loud enough to awaken the dragon.

  • 2
    \$\begingroup\$ May be helpful to include that the diameter of Icespire Hold doesn't exceed about 200' and is surrounded by ice. On the other hand, Cryovain is also described as dim-witted. \$\endgroup\$
    – NotArch
    May 30, 2023 at 14:54
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    \$\begingroup\$ @NautArch On the other other hand, dimwitted != hard of hearing.. \$\endgroup\$
    – Questor
    May 30, 2023 at 21:45
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    \$\begingroup\$ @Questor oh geez, no. It’s Hearing!= understanding \$\endgroup\$
    – NotArch
    May 30, 2023 at 23:51
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    \$\begingroup\$ Ice is a formidable transmitter of sound - smacking something into an ice wall can be heard quite some meters resounding from the wall where the air has not yet brought the sound! \$\endgroup\$
    – Trish
    May 31, 2023 at 8:32

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