20 Missable NPCs That Give You Incredible Rewards

Ghost Master is a strategy game where you command a team of specters bent on spooking and messing with every mortal in sight.

Throughout the game, you unlock more ghosts for your undead crew by either finishing chapters or freeing trapped spirits that you encounter in individual levels.

Each trapped soul can be tracked by their icon on the sidebar, and it tells you exactly what you need to do to set them free, making their acquisition easy for the most part (unless their request is unnecessarily complicated).

However, there is one incredibly rare type of spirit, which you can only acquire if you manage to summon him on the map, and you won't even know he exists until you accidentally do it.

Stormtalon is the only thunder spirit in the game.  He appears in the mission "Spooky Hollow," and unlike every other unlockable spectre, his icon doesn't appear on the sidebar.

The only way to find him is to conjure a storm near the burned tree on the map, combining your ghost's Gusts, Rain, Distant Thunder, and Gather Winds powers all at once.

Afterward, Stormtalon will appear and immediately join your crew, giving you access to some of the most powerful weather and electricity abilities in the game.