data(spells): add batch 3 of PC spell list (32 spells)

data/spells/unseen_servant.json

@@ -0,0 +1,10 @@
+{
+  "name": "Unseen Servant",
+  "level": 1,
+  "school": "conjuration",
+  "range": "close",
+  "save": "none",
+  "base_dc": 10,
+  "effects": [],
+  "description": "An invisible, mindless, shapeless force performs simple tasks at your command for 1 hour/level: fetching, opening unstuck doors, holding chairs, cleaning or mending (effective Strength 2, speed 15 ft., no attacks, DC 10 skill limit). No combat effect: object manipulation by invisible servants is not modeled by the engine."
+}