Hi all, I'm currently collecting data on the HP of the monsters in at various depths in the Clockworks. I believe this information will be useful for people who are trying to decide how to gear for a particular level, and whether the damage bonuses on their gear will reduce the number of hits to kill a particular monster. I'm using the space to store and share the information I gather.

General observations:
- There does not seem to be any randomization in monster HP. All monsters of a particular type will have the same amount of HP on a particular depth.
- Many monster types share a common base HP. That is to say, a Gun Puppy on Depth 9 will have the same amount of HP as a Scuttlebot on Depth 9. So far, I've found these monster families to be part of this "standard" group: Chromalisks, Wolvers, Gun Puppies, Scuttlebots, Greavers, Gremlin Thwackers, Jelly Cubes, Lichens, Polyps, Howlitzers, Kats, Gremlin Demos, Gremlin Scorchers, and Wings. I'm currently missing information on Trojans, and the Gremlins in Crimson Hammer.
- Shankles, Gremlin Menders, and Devilites have 75% of the HP of a normal monster.
- Retrodes, Mecha Knights, and some Zombies have 150% of the HP of a normal monster. Slag Walkers in FSC, Drouls in Concrete Jungles, and Frozen Shamblers in Candlestick Keeps have this bonus. Frankenzoms and the regular Zombies in graveyards do not. Needs more testing.
- Lumbers and Rock Jellies have about 200% of the HP of a normal monster.
- The smallest Lichens start with the same amount of HP as a normal monster. When two Lichens merge, they despawn and a new, larger Lichen with full HP spawns in place with the combined size of the two individual Lichens added together. Each additional Lichen beyond the first increases the total health of the larger Lichens by 25% of the base value. and
- Alpha Wolvers seem to have about 200% of the HP of a normal monster. Edit: Actually, Alpha Wolvers do weird things to your damage and seem to do some random recovery on their own, so I'm not sure about this.
- Phantoms seem to have about 150% of the HP of a normal monster.
- When in a party, each additional member increases the HP of newly spawned monsters by a third, rounded down. When in a 4-person party, all monsters have double their normal amount of HP. This only applies to newly spawned monsters and the entering and exiting of party members does not affect the HP of monsters already present in the level. On a level such as Deconstruction Zone, where nearly all monsters spawn at soon as you enter, this means that entering the map while solo and having three people join you effectively makes the level twice as easy.

Listed below are the HP values of normal monsters. Some information is incomplete due to not having enough monsters to test yet.
Monster HP by depth
1 - 40
2 - 59
3 - 77
4 (Terminal/Mission) - 95
5 - 114
6 - 132
7 - 150
8 (Moorcraft Manor)
9 - 160
10 - 187
11 - 214
12 - 241
13 (Terminal)
14 - 295
15 - 322
16 - 349
17 - 375
18 (Emberlight)
19 - 450
20 - 507
21 - 563
22 - 617~619
23 (Terminal)
24 - 673~774
25 - 765~792
26 - 799~928
27 - 899~912
28 - 965~972

Snarbolax - 661~693