Leveling up Spirits

[Shadowcran]

1. Zerock- Underground Blades
2. Sleem- Poison Spit is worthless, but use it as cheap way to level up Sleem. Boost Glot's Armor for later as all the other abilities are pretty much worthless late game and the armor can at least protect your tank, preferably a troop of Emerald Dragons
3. Lina-Just get to Gizmo and level it up. the rest? meh
4. Reaper-rage Draining. The rest is meh