Wizkids Rules!

I have a question about Apocalypse: Baron from the Secret Wars set.

His ability text reads as follows:

While Apocalypse is active, when you could use a Global Ability, you may pay bolt/mask and field Sidekicks from your Used Pile and bag until you have 4 Sidekicks in the Field Zone.

If I use Apocalypse's ability and I have sidekicks in both my Used Pile and my bag, do I get to choose where to field sidekicks from (i.e. could I field sidekicks exclusively from my bag), or do I have to field sidekicks from my Used Pile first before going to the bag?

Thank you for your time.

There is no sequence or exclusivity from where you can field your Sidekick dice. You can field dice from your bag and/or Used Pile in any order you choose until you have a total of 4 Sidekick dice.