A style-comparison rewrite in reply to https://www.reddit.com/r/PowerShell/comments/5p6xxd/i_like_dnd_so_i_wrote_a_cmdlet_to_roll_polyhedral/

InvokeDice.ps1

<#
.Synopsis
   Roll dice
.DESCRIPTION
   Given a role-playing description of dice, e.g. "2d6", return an object
   with the randomly rolled results
.EXAMPLE
   Invoke-Dice 2d6
.EXAMPLE
   Invoke-Dice 2d6 -Bonus 3
.INPUTS
    Dice - A string in the format "2d6" with the number of rolls, "d" and then
    the number of sides on each die
.INPUTS
    Bonus - A number to add to the total of the natural dice roll. Defaults to 0.
#>
function Invoke-Dice {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory=$true)]
        [string]$Dice,
        [int]$Bonus = 0
    )
    [int]$NumDice, [int]$DieSides = $Dice.Split('d')
    $DieRolls= 1..$NumDice | ForEach-Object {
        [int](Get-Random -Maximum $DieSides) +1
    }
    $Sum = ($DieRolls | Measure-Object -Sum).Sum
    $Out = New-Object psobject -Property ([ordered]@{
        DieRolls = $DieRolls
        Sum = $Sum
        Bonus = $Bonus
        Total = $Sum + $Bonus
    })
    Write-Output $Out
}