
joep |

So the party has encountered Silas Vekker and had to seek out the remains of his brother Karivek.
Every has Boots of the Winterland which helps them walking on the snow and ice and to endure the cold.
The mage casts Wind Walk allowing them to turn gaseous form and walk this way.
So the Wind Walk says
Normally, a wind walker flies at a speed of 10 feet with perfect
maneuverability. If desired by the subject, a magical wind wafts a
wind walker along at up to 600 feet per round (60 mph) with poor
maneuverability.
I understand that going the 600ft would be poor maneuverability. But what if they moved at 120ft? Is it still poor
Next, they arrive to the location with the bones. Since the wizard could not do the whole party one of them was riding on a wonderous figurine, a griffon.
They moved to were the bones were and I had the Advanced Frost Worm appear.
It used it's breathe and then when it was time to attack they stated he could not see any of them that were wind walking because they were gaseous form.
Is this true?
Are you just a cloud vapor?
You alter the substance of your body to a cloudlike vapor (as the
gaseous form spell) and move through the air, possibly at great
speed.
Each change to and from vaporous form takes 5 rounds
Gaseous Form spell:
The subject and all its gear become insubstantial, misty, and
translucent. Its material armor (including natural armor) becomes
worthless, though its size, Dexterity, deflection bonuses, and armor
bonuses from force effects still apply. The subject gains DR 10/
magic and becomes immune to poison, sneak attacks, and critical
hits. It can’t attack or cast spells with verbal, somatic, material, or
focus components while in gaseous form. This does not rule out
the use of certain spells that the subject may have prepared using
the feats Silent Spell, Still Spell, and Eschew Materials. The subject
also loses supernatural abilities while in gaseous form. If it has a
touch spell ready to use, that spell is discharged harmlessly when
the gaseous form spell takes effect.
A gaseous creature can’t run, but it can fly at a speed of 10 feet
and automatically succeeds on all Fly skill checks. It can pass through
small holes or narrow openings, even mere cracks, with all it was
wearing or holding in its hands, as long as the spell persists. The
creature is subject to the effects of wind, and it can’t enter water or
other liquid. It also can’t manipulate objects or activate items, even
those carried along with its gaseous form. Continuously active items
remain active, though in some cases their effects may be moot.
The one party member that was on the griffon failed his save against the Frost Wurm and paniced and ran.
The rest of the party went into the Fog and waited 5 rounds to turn back to natural form and said that while in gaseous form and within the fog they had total concealment and could not be seen and that the Frost Wurm didn't even know of there presence.
I could not find anything within Wind Walk or Gaseous Form on whether this is accurate or not.
Plus in Gaseous Form, you lose everything, attacks, spells, etc. So if you are visible to the creature, Then you are a huge disadvantage.

Latrecis |

First if they are moving faster than 10 feet per round, they have poor maneuverability.
Second the fog in the area of Karivek's corpse is only 1 foot high - this makes it hard to see the terrain but does not provide immediate cover for gaseous form creatures. I would permit pc's to advance in gaseous form with concealment if they explicitly stated they were moving in the fog ("crawling" at ground level.) Any movement faster than 10' per round would leave their passage and presence visible.
Windwalk nor gaseous form make them invisible. So unless they were explicitly hiding in the low fog, the worm should see them. And even if it doesn't, being in such form does nothing to protect them from being in the area of a breath weapon. So pending how they were arranged around the griffon-riding character, they should have been hit as well.
Lastly converting from gas to solid form takes 5 rounds. You are not gas for 4.999 of those rounds and solid in the last moment. I would argue that at some point prior to the end of 5 rounds, you become clearly visible even if "laying" in the fog. The worm should have it's way with them for at least a round or two before they "solidify." Changing states with Windwalk in the presence of hostile enemies should be an exceptionally dangerous activity.
Also, being gaseous does nothing to protect you from Karivek's corrupting touch. He should mess them up but good especially while they are unable to act during the transformation.

JohnHawkins |

Windwalk is meant to be a long distance travel spell not a tactical movement spell. I have always considered the 5 turn transformation time is designed to make windwalking into combat to be suicidal.
Gaseous form is clearly vulnerable to physical attacks, it gives DR10 Magic, and at the same time prevents you making attacks. So if you windwalk in next to an enemy you spend 5 rounds being hammered while unable to fight back.
If going faster than 10 movement then your maneuverability is poor, gaseous form does not make you invisible it makes you a man shaped cloud of vapour , this means that you are visible unless you have some cover.
Moral of this story is that you drop out of Windwalk some distance from any combat and then approach in a form you can actually fight in, or you die