Heroes' Feast

6th-Level Conjuration
Casting Time: 10 minutes
Range: Self (10-foot cube
Components: VSM($) (a gem-encrusted bowl worth at least 1,000 gp, which the spell consumes)
Duration: Instantaneous

You conjure a feast that appears on a surface in an unoccupied 10-foot Cube next to you. The feast takes 1 hour to consume and disappears at the end of that time, and the beneficial effects don't set in until this hour is over. Up to twelve creatures can partake of the feast, though larger creatures must consume more food to gain the benefits.

A creature that partakes gains several benefits, which last for 24 hours. The creature has Resistance to Poison damage, and it has Immunity to the Frightened and Poisoned conditions. Its Hit Point maximum also increases by 2d10, and it gains the same number of Hit Points.

If your party partakes of a Heroes' Fest during Survival, when rolling the Food and Water d100 Test, gain a +24 bonus to your Food and Water d100 Tests, and ignore the first 12 creatures when determining group size for these rolls. The party earns one success on a Failure, two on a Success, and three on a Critical Success. The creatures who partook of this feast automatically succeed on saving throws from Consequences on the Food or Water d100 Tests.

At Higher Levels. Two additional creatures can partake of the feast, increasing the bonus to Food and Water d100 Tests by +4 and ignoring two additional creatures during Survival, for each slot level above 6th

Source: PHB 250, SRD

Changelog

Added upcasting option.
Changed immunity to poison damage to resistance.
Added Survival system functionality, added caveats for larger creatures requiring more food.