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		Bloodborne : Quick Tutorial on Gem Modding

			   Guide by Aladore384


    			    contact@aladore.fr

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Want this ?

1. https://www.youtube.com/watch?v=ec5jWyelUyU

2. https://www.youtube.com/watch?v=-LLlB4USdMo

3. https://www.youtube.com/watch?v=skL5X_d7QDw

Or that ?

http://imgur.com/a/AgYTX

Heck, you could even make a gun with 3x 33.8% Blood!!

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Before we start, friendly advice : MAKE BACKUPS!!!

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Gems are written twice within the savedata:
1. Gem information
2. Gem location

The latter doesn't matter, what you want to find is the former. Find the gem,
and modify its attributes.

A typical gem looks like this (written in little endian) :

06 0E 81 C0 / CC 0F 10 80 / 01 00 00 00 / 02 00 00 00 /
B3 EA 01 00 / 02 A1 00 00 / FF FF FF FF /

06 0E 81 C0 : don't touch it, it's the ID. Each gem has its own ID.
CC 0F 10 80 : gem's source, here it's Watchers Boss
01 00 00 00 : quantity, always leave at 01 00 00 00
02 00 00 00 : shape (01 radial, 02 triangle, 04 waning, 08 circlet, 3F droplet)

From there, each 4 bytes is a single effect. If you want only 1 effect,
fill the first 4 bytes with the associated numbers,
and the effect slots you want empty with FF FF FF FF.

B3 EA 01 00 : effect 1 (here Bolt 27.2%)
02 A1 00 00 : effect 2 (here Stamina cost 3.2%)
FF FF FF FF : effect 3 (here empty)

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Gem Sources

CC 0F 10 80 : Watchers Boss
C0 0F 10 80 : Watchers Mob

76 0B 10 80 : Blood-starved Beast Boss

C6 06 10 80 : Brainsucker Boss
BC 06 10 80 : Brainsucker Mob

31 10 10 80 : Pthumerian Elder Boss

ED 12 10 80 : Headless Bloodletting Beast Boss

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Primary Effects

9B EE 01 00 : 27.2% phys (9C EE 01 00 = 28.1%)
E3 E2 01 00 : 27.2% arc (E4 E2 01 00 = 28.1%)
CB E6 01 00 : 27.2% fire (CC E6 01 00 = 28.1%)
B3 EA 01 00 : 27.2% bolt (B4 EA 01 00 = 28.1%)
83 F2 01 00 : 23.6% atk (84 F2 01 00 = 24.4%)
FA DE 01 00 : 31.5% blood (FB DE 01 00  = 32.6% , FC DE 01 00 = 33.8%)
13 DB 01 00 : 32.6% thrust (14 DB 01 00 = 33.8%)
2B D7 01 00 : 32.6% blunt (2C D7 01 00 = 33.8%)


1B AA 02 00 : rank 19 slow poison (18.1) (1C AA 02 00 = rank 20)
7B 1D 02 00 : rank 19 rapid poison (21.7) (7C 1D 02 00 = rank 20)
7B 9A 02 00 : rank 19 beasthunter (32.6%) (7C 9A 02 00 = rank 20)
C3 11 02 00 : rank 19 kinhunter (32.6%) (C4 11 02 00 = rank 20)
8B 44 02 00 : rank 19 phys fool (34.4%) (8C 44 02 00 = rank 20)
43 50 02 00 : rank 19 nourishing fool (29%) (44 50 02 00 = rank 20)
2B 54 02 00 : rank 19 nourishing poor (30.8%) (2C 54 02 00 = rank 20)

97 DE 01 00 : 28.7% blood (98 DE 01 00 = 29.7%)

9B D5 01 00 : 11.7% Blunt (9C D5 01 00 = 12.2%)
0B ED 01 00 : 9.8% Phys (0C ED 01 00 = 10.1%)

44 05 02 00 : 65 arc scaling

F0 F9 01 00 : 65 str scaling

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Secondary Effects

3F 33 00 00 : +7.3 blood (40 33 00 00 = 7.5)

53 38 00 00 : +72.5 arc (54 38 00 00 = 75)

28 37 00 00 : +15arc
10 3B 00 00 : +15fire
F8 3E 00 00 : +15bolt

E0 42 00 00 : +15phys

D0 98 00 00 : 6% open foes

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Curses

04 A1 00 00 : stamina costs 3.4%
03 A1 00 00 : stamina costs 3.3%
02 A1 00 00 : stamina costs 3.2%
01 A1 00 00 : stamina costs 3%
00 A1 00 00 : stamina costs 2.9%

9F A0 00 00 : stamina costs 1.5%
9E A0 00 00 : stamina costs 1.4%

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N.B. : Runes seem to work in the same fashion.
For you, here is data for Guidance rune.
The first 4 bytes prolly differ from one save to another.
I suggest locating it with the second set of 4 bytes.
You want to modify the last set of 4 bytes :

Tier 1 : 85 01 80 C0 / 40 96 01 80 / 02 00 00 00 / 01 00 00 00 / 08 69 11 00
Tier 2 : 8D 01 80 C0 / 41 96 01 80 / 02 00 00 00 / 01 00 00 00 / 09 69 11 00
Tier 3 : XX XX XX XX / XX 96 01 80 / 02 00 00 00 / 01 00 00 00 / 0A 69 11 00

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Credits

MrRic013 : finding the Droplet shape data
manulbrona : various primary effects data