The spell Beacon of Hope lasts for one minute and states:
For the duration, each target […] regains the maximum number of hit points possible from any healing.
If a party takes a short rest, can the party's Cleric cast this spell during the last minute of the rest to ensure that the party regains the maximum possible hit points on their hit dice rolls?
If casting the spell interrupts the rest for the Cleric, can they still use Beacon of Hope to maximize the hit dice healing for the rest of the party?
Best Answer
It can be used to maximise healing from resting, if your characters can coordinate it.
Hit Points (PHB 196, bolded for emphasis):
Receiving hit points is healing.
Resting (PHB 186):
So resting is healing, and Beacon of Hope does not interrupt the long resting of the party.
So Beacon of Hope can be used to maximize the hit dice healing for the resting of the party during a long rest for all members.
For the Short Rest only the other party members can benefit from the maximised healing. As the cleric would be casting a spell, and a single spell is strenuous enough (compare to the 1-hour leeway of Long Rests):
Confirmed in the SAC V. 2.5 P. 10:
Do mind, though, that this takes a form of coordination of time that not every DM would rule as feasible or plausible due to the necessarily required understanding from a character point of view and their knowledge about the (mechanics of the) world.