Board Thread:Questions and Answers/@comment-24869193-20140508142049/@comment-24273207-20140512023004

Is it on Ethereal Island? (Ethereal monsters can be teleported to Ethereal Island when they reach level 15.)  If so, it's shard limit may have not yet maxed out, so you can tap on it to collect the shards before it reaches it's limit. If not, it earns regular coins until teleported.