Limiting Velocity for the Player when touching a Union

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When the player first enters the cobweb, you can simply grab their mass and slow them down using a couple tricks:

Firstly, you can slow down their walk speed, which will control horizontal speed.
For vertical speed, you can apply an upward force to their character as they are falling (similar to cobwebs in Minecraft). The best approach from what I have seen is to use a VectorForce. In this case, it should go on the HumanoidRootPart.

The VectorForce will apply a continuous force of specified scale to a given physics body. You can simply adjust the effect to get the desired speed you want the player to fall or slow down at when walking in the cobwebs:

The Module I used below is ZonePlus: ZonePlus v3.2.0 | Construct dynamic zones and effectively determine players and parts within their boundaries

local Zone = require(game:GetService("ReplicatedStorage"):WaitForChild("Zone"))
local Cobweb = Zone.new(workspace.Cobweb)

local playersInCobweb = {}

local COBWEB_GRAVITY = 0.35

local function getCharacterMass(character: Model): any
    if character then
        local mass
        for _, part in pairs(character) do
            if part:IsA("BasePart") then
                mass += part:GetMass()
            end
        end
        return mass
    end
end

local function SlowdownPlayer(player: Player)
    if player then
        local character = player.Character
        if character then
            local HRP = character.HumanoidRootPart
            if HRP then
                local characterMass = getCharacterMass(character)
                local vf = Instance.new("VectorForce")
                vf.Parent = HRP
                vf.Attachment0 = HRP.RootAttachment
                vf.RelativeTo = Enum.ActuatorRelativeTo.World
                vf.Force = Vector3.new(
                    0,
                    (characterMass * workspace.Gravity) * COBWEB_GRAVITY,
                    0
                )
                return vf
            end
        end
    end
end

Cobweb.playerEntered:Connect(function(player)
    if player then
        local character = player.Character
        if character then
            local humanoid = character:FindFirstChild("Humanoid")
            if humanoid then
                humanoid.WalkSpeed = 10
                playersInCobweb[player] = SlowdownPlayer(player)
            end
        end
    end
end)

Cobweb.playerExited:Connect(function(player)
    if player and playersInCobweb[player] then
        local character = player.Character
        if character then
            local humanoid = character:FindFirstChild("Humanoid")
            if humanoid then
                humanoid.WalkSpeed = 16 -- Change to other, if desired
            end
        end
        playersInCobweb[player]:Destroy()
    end
end)
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