WOIN O.L.D. Spells & Skills Question

[Len]

According to the rules you can use multiple magic skills to cast a spell (to combine two or more different effects):

You can use more than one skill or secret in a spell beyond the two in a basic cantrip.

My question is, how many skill dice do you get for a spell using two skills? Is it the sum of the two skills, or the greater of the two, or the lesser?

 

[Shaun Palmer]

I've been running games using the lesser, otherwise players could throw in a random skill that they are good at to gain more dice.

 

[Morrus]

You only ever ushe one skill in a dice pool. You would use the skill in which you’d spent the most MP in enhancements. In a tie, choose.