Yellow Shard

Description
The Yellow Portal Stone Shard is a common item usually dropped by enemies in the low to mid-level range. It can also be found more rarely while mining ores after the first boss. Three of these shards can be used to craft a Yellow Portal Stone.

Source

 * Most low to mid-level enemies.
 * Mining ores on islands after the first boss.

Crafting Uses

 * Yellow Portal Stone