Combine as follows:
1. Resistance / Magic (x2) -> Guts (x2)
2. Quickness / Endurance (x2) -> Rouse (x2)
3. Resistance / Magic (x1) + Guts (x2) -> Capability (x1)
4. Quickness / Endurance (x1) + Rouse (x2) -> Keenness (x1)
5. Capability (x1) + Keenness (x1) -> Enchantment (x1)
Total Arance charges should be 7, you can also combine using an older method involving using Resistor runes but that takes an extra couple of charges.
Hope that helps...
[EDIT] or what lonerman posted ...must type faster hehe