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NOTE: if your looking for information on how to use the decal command, go to DecalThis page, This page assumes you have already read that or know how decals work.
The decal & effect commands has 2 ways to place decals, either using the ID from the roblox catalog, or saying the name of the effect / decal, For example, Saying !decal Grass will make a picture of grass appear instead of having to type the ID from the roblox catalog, This page will list many of the Shortcut decals & effects.
These commands are case-sensitive
!decal/effect fire
!decal/effect grass
!decal/effect portal
!decal/effect blux
!decal/effect warp
!decal/effect sign
!decal/effect effect
!decal/effect tele
!decal/effect stattele
!decal/effect powerup
!decal/effect soundblock
!decal/effect teamer
!decal/effect statgiver
!decal/effect statremover
!decal/effect tripper
!decal/effect kill
!decal/effect baller