Help needed: What happens to OL ingame cards between encounters

By Dreepa, in Descent: Journeys in the Dark

Hi.

We are currently playing the intermezzo and now setting up encounter 2.

We know that the OL keeps his hand and discard pile. But what happens to ingame cards?

He buffed a goblin group with that dragonamulett card. Now we are confused if it stays ingame (since he chose goblins for encounter 2 as well).

Rules mention only hand cards...

Thanks!

Look at the rules for overlord cards in the Manor of ravens rulebook- the cards in play at the end of an encounter get discarded.