There is a sign-up bonus offer currently advertised for 70,000 enrich miles for the CIMB Enrich World Elite Credit Card which prompted me to look into the card.

In addition to the sign-up bonus:
Enjoy unlimited access to Malaysia Airlines Golden Lounge in and outside of Malaysia. Present your CIMB Enrich World Elite Credit Card together with your Malaysia Airlines boarding pass at any Golden Lounge

What I can't find anywhere is whether this allows a guest (which I think is unlikely) or if the Supplementary Card holder also receives the lounge perk.

On the card's main page it says:
Share the benefits of your CIMB Bank credit card with your loved ones by giving them a supplementary card today.

Does anyone have this card who knows?