Speaking as a lay person, I'd say use the numbers loosely as a rough guide, if at all, and just make events as dramatic as you can. Throw in the sentient, growing void at whatever point it seems like it'll have the biggest impact.
When I played through that module a few years back, I don't remember what clues we had as to the nature of the 'mass', and when we discovered it in the cave I jumped into it, under the impression that was an energy field that held some malevolent force inside.
Turns out there was nothing in there.
Gnome Boy (a.k.a. "Jon") • DCC play-tester @ DDC 35, Feb 2011. • Beta DL 2111, 7:00 AM PT, 8 June 11.
Playing RPGs since 1977 • Quasi-occasional member of the Legion of 8th-Level Fighters - Holds the power to play gnomes at will!
Here Be DCC Monsters...
Pbp Secret of Bone Hill characters:
Flavia, WAR, Beekeeper, L, Str 10, Agi 10, Stm 7, Per 10, Int 12, Lck 7, AC 10 hp 5, staff, jar of honey, 10-ft pole, 1 pc chalk, 50' rope, 2 torches (1 lit)
Hector, DWARF Apothecarist, L, Str 5, Agi 11, Stm 12, Per 10, Int 6, Lck 10, AC 10, hp 11, sword, shield, cudgel, steel vial, chest, flint & steel, empty flask, lg sack
Chendris, WIZ, Alchemist, N, Str 11, Agi 9, Stm 12, Per 15, Int 13, Lck 15, AC 10, hp 3, staff, empty flask, 50' rope, 2 candles, lg sack, oil (1 flsk), 1 torch, snakeskin tome; speaks gnoll
Darrow, CLR, Hunter, N, Str 11, Agi 12, Stm 8, Per 16, Int 7, Lck 12, AC 10 hp 5, short bow, 6 arrow, 10-ft pole, deer pelt, torch (lit)