I found in the patch-notes:
- adjusted spell damage against targets with a different level (now linear decrease / increase instead of exponential)
Now on its own this doesn't mean a whole lot, since we do not know it is a nerf or a boost to spell-damage, as we do not know the formula's.
However, I was lucky enough to have an old combat-log in which you can see what it does in practice. Same spec, same gear on BD, same 50% body-debuff on same mobs:
PRE-PATCH:
[17:40:46] Your bone warmage hits the drakulv axehand for 135 (-23) damage!
[17:40:43] Your bone warmage hits the drakulv axehand for 144 (-25) damage!
[17:40:49] Your bone warmage hits the drakulv axehand for 153 (-27) damage!
[17:41:18] Your bone warmage hits the drakulv axehand for 159 (+50) damage!
[17:42:09] Your bone warmage hits the drakulv axehand for 165 (-29) damage!
[17:41:30] Your bone warmage hits the drakulv axehand for 168 (+53) damage!
[17:41:35] Your bone warmage hits the drakulv axehand for 168 (+53) damage!
[17:41:33] Your bone warmage hits the drakulv axehand for 185 (+59) damage!
[17:40:38] Your bone warmage hits the drakulv axehand for 201 (+64) damage!
[17:42:44] Your bone warmage hits the drakulv axehand for 201 (+64) damage!
[17:41:24] Your bone warmage hits the drakulv axehand for 210 (+67) damage!
[17:42:59] Your bone warmage hits the drakulv axehand for 229 (+73) damage!
[17:40:35] Your bone warmage hits the drakulv axehand for 242 (+77) damage!
[17:42:07] Your bone warmage hits the drakulv axehand for 245 (+78) damage!
[17:41:59] Your bone warmage hits the drakulv axehand for 253 (+81) damage!
[17:40:41] Your bone warmage hits the drakulv axehand for 254 (+81) damage!
[17:41:38] Your bone warmage hits the drakulv axehand for 260 (+83) damage!
[17:42:11] Your bone warmage hits the drakulv axehand for 263 (+84) damage!
[17:42:01] Your bone warmage hits the drakulv axehand for 271 (+86) damage!
[17:42:17] Your bone warmage hits the drakulv sacrificer for 199 (+63) damage!
[17:41:07] Your bone warmage hits the drakulv sacrificer for 256 (+82) damage!
[17:42:20] Your bone warmage hits the drakulv sacrificer for 263 (+84) damage!
[17:41:09] Your bone warmage hits the drakulv sacrificer for 274 (+87) damage!
[17:41:05] Your bone warmage hits the drakulv sacrificer for 289 (+92) damage!
POST-PATCH:
[06:27:47] Your bone warmage hits the drakulv axehand for 132 (+42) damage!
[06:28:15] Your bone warmage hits the drakulv axehand for 134 (+43) damage!
[06:28:32] Your bone warmage hits the drakulv axehand for 134 (+43) damage!
[06:28:52] Your bone warmage hits the drakulv axehand for 145 (+46) damage!
[06:27:42] Your bone warmage hits the drakulv axehand for 147 (+47) damage!
[06:27:52] Your bone warmage hits the drakulv axehand for 147 (+47) damage!
[06:27:30] Your bone warmage hits the drakulv axehand for 150 (+48) damage!
[06:28:34] Your bone warmage hits the drakulv axehand for 150 (+48) damage!
[06:27:28] Your bone warmage hits the drakulv axehand for 151 (+48) damage!
[06:28:54] Your bone warmage hits the drakulv axehand for 157 (+50) damage!
[06:29:07] Your bone warmage hits the drakulv axehand for 167 (+53) damage!
[06:27:44] Your bone warmage hits the drakulv axehand for 168 (+53) damage!
[06:28:26] Your bone warmage hits the drakulv axehand for 171 (+54) damage!
[06:27:59] Your bone warmage hits the drakulv axehand for 172 (+55) damage!
[06:28:09] Your bone warmage hits the drakulv axehand for 173 (+55) damage!
[06:27:54] Your bone warmage hits the drakulv axehand for 182 (+58) damage!
[06:28:04] Your bone warmage hits the drakulv axehand for 182 (+58) damage!
[06:28:59] Your bone warmage hits the drakulv axehand for 187 (+59) damage!
[06:28:57] Your bone warmage hits the drakulv axehand for 188 (+60) damage!
[06:28:37] Your bone warmage hits the drakulv axehand for 190 (+60) damage!
[06:28:06] Your bone warmage hits the drakulv axehand for 191 (+61) damage!
[06:27:50] Your bone warmage hits the drakulv axehand for 194 (+62) damage!
[06:29:02] Your bone warmage hits the drakulv axehand for 194 (+62) damage!
[06:28:40] Your bone warmage hits the drakulv axehand for 84 (-14) damage!
[06:29:42] Your bone warmage hits the drakulv sacrificer for 143 (+45) damage!
[06:29:30] Your bone warmage hits the drakulv sacrificer for 144 (+46) damage!
[06:29:32] Your bone warmage hits the drakulv sacrificer for 170 (+54) damage!
[06:29:45] Your bone warmage hits the drakulv sacrificer for 176 (+56) damage!
[06:29:35] Your bone warmage hits the drakulv sacrificer for 186 (+59) damage!
[06:29:37] Your bone warmage hits the drakulv sacrificer for 199 (+63) damage!
[06:29:40] Your bone warmage hits the drakulv sacrificer for 204 (+65) damage!
That is roughly a 25% reduction in damage. Now leaving the discussion aside for a minute if that was warranted and/or needed, it should be painfully obvious that if you change something this much - it should be documented much clearer in patch-notes as should it's implications. A 25% nerf to Darkness pets is a huge change - and if the patch-notes just say something about changing the way spells scale, but don't state how much that is in practice is really poor communication.
- adjusted spell damage against targets with a different level (now linear decrease / increase instead of exponential)
Now on its own this doesn't mean a whole lot, since we do not know it is a nerf or a boost to spell-damage, as we do not know the formula's.
However, I was lucky enough to have an old combat-log in which you can see what it does in practice. Same spec, same gear on BD, same 50% body-debuff on same mobs:
PRE-PATCH:
[17:40:46] Your bone warmage hits the drakulv axehand for 135 (-23) damage!
[17:40:43] Your bone warmage hits the drakulv axehand for 144 (-25) damage!
[17:40:49] Your bone warmage hits the drakulv axehand for 153 (-27) damage!
[17:41:18] Your bone warmage hits the drakulv axehand for 159 (+50) damage!
[17:42:09] Your bone warmage hits the drakulv axehand for 165 (-29) damage!
[17:41:30] Your bone warmage hits the drakulv axehand for 168 (+53) damage!
[17:41:35] Your bone warmage hits the drakulv axehand for 168 (+53) damage!
[17:41:33] Your bone warmage hits the drakulv axehand for 185 (+59) damage!
[17:40:38] Your bone warmage hits the drakulv axehand for 201 (+64) damage!
[17:42:44] Your bone warmage hits the drakulv axehand for 201 (+64) damage!
[17:41:24] Your bone warmage hits the drakulv axehand for 210 (+67) damage!
[17:42:59] Your bone warmage hits the drakulv axehand for 229 (+73) damage!
[17:40:35] Your bone warmage hits the drakulv axehand for 242 (+77) damage!
[17:42:07] Your bone warmage hits the drakulv axehand for 245 (+78) damage!
[17:41:59] Your bone warmage hits the drakulv axehand for 253 (+81) damage!
[17:40:41] Your bone warmage hits the drakulv axehand for 254 (+81) damage!
[17:41:38] Your bone warmage hits the drakulv axehand for 260 (+83) damage!
[17:42:11] Your bone warmage hits the drakulv axehand for 263 (+84) damage!
[17:42:01] Your bone warmage hits the drakulv axehand for 271 (+86) damage!
[17:42:17] Your bone warmage hits the drakulv sacrificer for 199 (+63) damage!
[17:41:07] Your bone warmage hits the drakulv sacrificer for 256 (+82) damage!
[17:42:20] Your bone warmage hits the drakulv sacrificer for 263 (+84) damage!
[17:41:09] Your bone warmage hits the drakulv sacrificer for 274 (+87) damage!
[17:41:05] Your bone warmage hits the drakulv sacrificer for 289 (+92) damage!
POST-PATCH:
[06:27:47] Your bone warmage hits the drakulv axehand for 132 (+42) damage!
[06:28:15] Your bone warmage hits the drakulv axehand for 134 (+43) damage!
[06:28:32] Your bone warmage hits the drakulv axehand for 134 (+43) damage!
[06:28:52] Your bone warmage hits the drakulv axehand for 145 (+46) damage!
[06:27:42] Your bone warmage hits the drakulv axehand for 147 (+47) damage!
[06:27:52] Your bone warmage hits the drakulv axehand for 147 (+47) damage!
[06:27:30] Your bone warmage hits the drakulv axehand for 150 (+48) damage!
[06:28:34] Your bone warmage hits the drakulv axehand for 150 (+48) damage!
[06:27:28] Your bone warmage hits the drakulv axehand for 151 (+48) damage!
[06:28:54] Your bone warmage hits the drakulv axehand for 157 (+50) damage!
[06:29:07] Your bone warmage hits the drakulv axehand for 167 (+53) damage!
[06:27:44] Your bone warmage hits the drakulv axehand for 168 (+53) damage!
[06:28:26] Your bone warmage hits the drakulv axehand for 171 (+54) damage!
[06:27:59] Your bone warmage hits the drakulv axehand for 172 (+55) damage!
[06:28:09] Your bone warmage hits the drakulv axehand for 173 (+55) damage!
[06:27:54] Your bone warmage hits the drakulv axehand for 182 (+58) damage!
[06:28:04] Your bone warmage hits the drakulv axehand for 182 (+58) damage!
[06:28:59] Your bone warmage hits the drakulv axehand for 187 (+59) damage!
[06:28:57] Your bone warmage hits the drakulv axehand for 188 (+60) damage!
[06:28:37] Your bone warmage hits the drakulv axehand for 190 (+60) damage!
[06:28:06] Your bone warmage hits the drakulv axehand for 191 (+61) damage!
[06:27:50] Your bone warmage hits the drakulv axehand for 194 (+62) damage!
[06:29:02] Your bone warmage hits the drakulv axehand for 194 (+62) damage!
[06:28:40] Your bone warmage hits the drakulv axehand for 84 (-14) damage!
[06:29:42] Your bone warmage hits the drakulv sacrificer for 143 (+45) damage!
[06:29:30] Your bone warmage hits the drakulv sacrificer for 144 (+46) damage!
[06:29:32] Your bone warmage hits the drakulv sacrificer for 170 (+54) damage!
[06:29:45] Your bone warmage hits the drakulv sacrificer for 176 (+56) damage!
[06:29:35] Your bone warmage hits the drakulv sacrificer for 186 (+59) damage!
[06:29:37] Your bone warmage hits the drakulv sacrificer for 199 (+63) damage!
[06:29:40] Your bone warmage hits the drakulv sacrificer for 204 (+65) damage!
That is roughly a 25% reduction in damage. Now leaving the discussion aside for a minute if that was warranted and/or needed, it should be painfully obvious that if you change something this much - it should be documented much clearer in patch-notes as should it's implications. A 25% nerf to Darkness pets is a huge change - and if the patch-notes just say something about changing the way spells scale, but don't state how much that is in practice is really poor communication.