The Needolin in Hollow Knight Silksong is a key instrument that opens harp doors and unlocks hidden areas across Pharloom. This guide explains exactly where to find it, how to obtain it, and how to use it to access the game’s secret passages and rewards, sticking strictly to the details provided by developer and press coverage.
To obtain the Needolin, players must defeat Widow in the halls above Haunted Bellhart. Access to Bellhart's upper reaches is gained via Shellwood to the west; from the Sister Splinter boss room, head east, navigate through the bell caves, and then loop back west to reopen the Shellwood resting bench shortcut for an easier return to Widow. At the end of the Widow fight, binding Widow with a Needle extracts the Needolin, granting the player the instrument needed to interact with harp doors across Pharloom.
With the Needolin in hand, players can open the harp doors that lead to the Weavenests scattered throughout Pharloom. These Weavenests grant powerful abilities and buffs, and while none of the upgrades are required for main story progression, they significantly ease exploration and combat. The Needolin thus serves as both a key and a catalyst for optional paths, rewarding diligent exploration even when progress is possible without them.
There are five Needolin doors in Pharloom to discover and open. Weavenest Atla sits on the eastern edge of Moss Grotto; Weavenest Cindril lies in the southeast corner of Far Fields; Weavenest Karn is on the western edge of the Wormways; Weavenest Murglin is in the southeast corner of Bilewater; and Weavenest Absolom is in the southeast corner of The Abyss. Not all doors can be reached immediately after defeating Widow, but the tool is now in the player's possession to open these routes when encountered.
Using the Needolin to access the Weavenests also unlocks environmental and NPC-driven moments — hearing NPCs sing or Hornet playing a lilting tune nearby. The Wormways section also hides Pollip Hearts for those pursuing additional exploration. Players who know where to find Shakra to buy maps will have an easier time locating many of haunted Pharloom’s secrets, making the Needolin a valuable companion for broader world discovery.
For a more comprehensive look at Bellhart and Widow, readers can consult part 11 of our Silksong walkthrough and the dedicated Widow boss guide referenced in Rock Paper Shotgun's coverage. Those resources provide deeper context for the route choices and combat setup required to reach Widow efficiently, as well as how the Weavenests fit into long-term progression.
In sum, the Needolin is obtained by defeating Widow and binding her in the halls above Haunted Bellhart, then used to unlock five Weavenests across Pharloom. While not mandatory for finishing the game, the doors opened by the Needolin offer powerful buffs and meaningful exploration rewards, encouraging players to chart out a route through Moss Grotto, Far Fields, Wormways, Bilewater, and The Abyss as they push toward hidden knowledge and richer capabilities.