How to get to the House of Hope in Baldur's Gate 3

You may remember the House of Hope from when Raphael first teleported you there for a not-at-all sinister chat during Act 1 of Baldur's Gate 3. The deal-making devil's home is located in the nine hells, so isn't the easiest location to breach. However, if you've arrived in Act 3 and turned down Raphael's deal to give you the Orphic Hammer, you're likely realising that the only other route is to steal it from him...
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