Hello! Yes the Dryads is the last part of the Main Mission, other than that, the Dryad Kingdom does offer some small side missions and a big one in the form of the hidden Cum Chambers. The Soul Contract in the current ItchIO version can only be obtained from the Wheel of Chance at the end of the infinite bridge. It is a 1% chance drop. In the early builds in Patreon, and on the next ITCHIO update the contract can drop from different enemies, or purchased to ease the grind. The last room of the of the Essence lakes is lost to time. If you find the lore note, the plans for the room/portal had to be destroyed as the creatures from withing where too strong and unpredictable. The Void was trying to recreate the creatures found in the Forgotten Chambers. Wonder why. Wink Wink. Anyways the 10 Void cum is needed on each re-entry to the Essene lakes as this is a grind area and players with enough power can in theory, get unlimited Void cum from it.