So, I'm attempting to write my very first campaign. I haven't been playing for very long, so I'm still a little unclear about how some things work. However, my brothers, whom I am writing this for, are both too young to DM, which is why I am for our little group. If this sounds like a bad idea, let me know. Very basically, the plot will be that the Yuan-Ti kingdom has begun to aggressively start kidnapping people for a sinister ritual they have planned. Here's where I am having a little trouble. The adventure is, at this point, starting with a rumor, which leads their characters to a cave, that happens to be home to a green dragon. The dragon asks them to take care of the Yuan-Ti and steal a key magical component OmegleAppvalley192168ll.onl/ of the ritual, because he made a deal with a dragon in that area that the two wouldn't interfere with each other. However, the dragon is pretending to be a metallic dragon of some kind, so they don't know that he's actually a green. My question is, would an illusion spell give the dragon the disguise he needs? The Monster Manual doesn't say that monochromatic dragons can shapeshift, so I pretty much ruled out him shapechanging into one for the duration of their encounter. I wanted to know whether or not a high enough illusion spell would last long enough for the dragon to either convince them to do as he asked, or if I should come up with a different start/ change some of the stats for it. Let me know if this actually a worthwhile idea, or if I should come up with a better start. Thank you for your input!
First, whatever group you have is the group you should be playing with! Excited to hear that you are taking on the DM mantle. As for the Green appearing as a different color could happen several ways. A magical item could be the easy way. True Polymorph could also do the trick, but illusion magic could also do the trick as long as the players are lower level and don't have anything that could easily counter it.