Inventory Bag C is a Legends of Idleon item: quest reward.

Inventory Bag C | Idleon Toolbox

Inventory_Bag_C

It says a Giant Wolf-like Golem was seen walking with the gem even deeper into the Jungle. Stiltzcho has purposefully smudged his signature so that it's not readable.

Scouting_Report

Hold down on this item to be teleported back to Town.

Bottled_Town_Teleport

Reach the Boss Room. It's a long way from home...

What_Lies_at_the_Heart_of_the_Forest

Complete Stiltzcho's Quests. Or, just ignore him and keep going to the boss room!