There is sort of TD tribal knowledge that the frequency of "hosing" of various attach modes is, in order of descending frequency:
- Melee
- Ranged
- Magic
It appears that in the 2015 Dungeons, there was an effort to bring balance to the rates of hosing across attack modes.
Here is a scorecard, and some notes based on this year's riddle reveal video. To me a "major" hoser is one that introduces an unavoidable, and essentially random chance of failure in the 50% or greater range. A "minor" hoser has a lesser failure chance, and/or is potentially avoidable by player choice/action, rather than random chance, or has some lesser impact (e.g. retribution damage).
In 10 combats across both dungeons:
- Melee completely disallowed: 0
- Melee major hoser: 3
- Melee minor hoser: 2
- Ranged completely disallowed: 1
- Ranged major hoser: 2
- Ranged minor hoser: 0
- Magic completely disallowed: 1
- Magic major hoser: 2
- Magic minor hoser: 2
All attack modes were hosed, with roughly the same prevalence. It looks to me like Magic was the most hosed, followed most likely by Melee and then Ranged (although I can see an argument that being completely disallowed is worse than one major and 2 minor hosers).
One could make the argument that the "Grub / Spider" room, which was the one where Magic was completely disabled shouldn't count, since it was really more of a manual dexterity puzzle and not a combat - however I'm leaving it in as: they were monsters, with monster cards, who were completely immune to magic.
Into the Underdark:
Carrion Crawler Hosers: None
Fungoid Hosers:
- Melee: 50% hit party member (major)
- Ranged: 50% hit party member (major)
- Magic - Slides: 50% hit party member (minor)
Salamander Hosers:
- Melee: Fire "aura" (not retribution) damage (minor)
- Magic: Completely immune to fire (minor)
Dread spider: None
Mindflayer Hosers:
- Melee: 50% miss (major)
- Ranged: Completely disabled
- Magic - Slides: Completely disabled
- Magic - Single Target: 50% miss (minor)
The Sable Gauntlet:
Water Weird Hosers:
All: DC-15 save to act (major)
Rot Grub/Tranceweaver Spider Hosers:
Magic: Completely disabled
Ethereal Hunter Hosers: None
Drow Hosers None:
Melee: Puck that lands in web is stuck (minor)
Soul Wraith Hosers: None