Hello !

I'm here with a simple question. What stats are used to calculate damages in case of multiclass.

Let me put it in context :

I'm currently having a tempest cleric 6 / evo wizard 2 / storm sorc 2 in my party. Let's say I cast a chain lightning. What stats are taken to calculate the damages ? Int ? Char ? Wis ?

The spell is a wizard spell so I was leaning on Int is being used but sorcerers get it too so I wondered on Char. Then I told myself that my highest level is on tempest cleric so I thought of Wis... Then I asked myself if it was not just taking the highest one ?

What is the general rule ? That would help me for different builds.

Thanks !