After having extensively tested most of the commonly used Blood Pacts, I turned towards the ones gathering dust. There were several gems out there which have some pretty amazing (unused) potential out there.
* Approximate formula if your level is less than or equal to 30:
HP Restored = 14 + Level + floor[TP/12.3]
* Approximate formula if your level is greater than 30:
HP Restored = 44 + 3*(Level-30) + floor[TP/12.3] * floor[Level*0.075 - 1]
One less than 30 is inaccurate, couldn't lower level below 30. Appears to add variable amounts of HP depending on TP/LEVEL.
Does NOT appear to be +X HP for every Y TP. See Wiki for testing.
Bigclaw (base) Delay =
Time taken: 118 seconds
3.93333 seconds/hit = ~4sec/hit
Time Taken = 94sec
time=57sec = 5.18181818 seconds/hit
About 5.2 seconds:
Delay = 312
Increase in delay = 73
Percentage Slow = 30% (!!!)
Range = 8" (around Target)
Duration: 90 seconds.
Same tier rank as Sleepga.
Centered around Target.
Very small radius (4"?)
Duration: 90 seconds, though often resisted down to 60 or 45 seconds.
Same tier as Sleepga.
Bio is 2hp/tick.
Additional DoTs WILL stack WITHOUT waking the monster, except those that deal "initial" damage, e.g. Bio/Dia/Helix
DoTs (including Bio) already on the monster will NOT wear off when applying Nightmare.
You can load up on DoTs (bio 2 included!) and then use Nightmare, the monster will sleep with an incredibly potent DoT on them.
Appears to have no dINT cap. Formula is still in progress but appears to be along the lines of:
Damage = (275+dINT) * MAB/MDB
How TP interacts with this is still unknown, appears to be 3 damage / 8 tp(?)
Paralyze seems very strong, comparable to Paralyze II.