Terestian Illhoof is an optional boss in Karazhan that can be found behind a "conspicuous bookcase". His minion Kil'rek is also part of this encounter.

	Item # Players   % Players   Desirability     [Girdle of the Prowler] 49599 15.93% Hunter 34100 68.75% Beast Mastery 23412 47.20%    Marksmanship 9280 18.71%    Survival 1408 2.84%    Shaman 12692 25.59% Enhancement 12167 24.53%    Restoration 281 0.57%    Elemental 244 0.49%    Paladin 2453 4.95% Retribution 2279 4.59%    Protection 87 0.18%    Holy 87 0.18%    Warrior 354 0.71% Fury 213 0.43%    Arms 113 0.23%    Protection 28 0.06%    [Malefic Girdle] 45097 14.48% Warlock 17201 38.14% Affliction 6701 14.86%    Demonology 5858 12.99%    Destruction 4642 10.29%    Mage 14243 31.58% Frost 6465 14.34%    Fire 4085 9.06%    Arcane 3693 8.19%    Priest 8116 18.00% Shadow 5722 12.69%    Holy 1621 3.59%    Discipline 773 1.71%    Druid 3420 7.58% Balance 2712 6.01%    Restoration 576 1.28%    Feral 132 0.29%    Shaman 1890 4.19% Elemental 1341 2.97%    Restoration 450 1.00%    Enhancement 99 0.22%    Paladin 227 0.50% Holy 185 0.41%    Retribution 42 0.09%    Protection 0 0.00%    [The Lightning Capacitor] 36487 11.72% Mage 18019 49.38% Frost 6790 18.61%    Fire 5945 16.29%    Arcane 5284 14.48%    Shaman 8507 23.32% Elemental 7358 20.17%    Enhancement 664 1.82%    Restoration 485 1.33%    Warlock 5896 16.16% Destruction 2155 5.91%    Demonology 2042 5.60%    Affliction 1699 4.66%    Druid 2407 6.60% Balance 2238 6.13%    Restoration 110 0.30%    Feral 59 0.16%    Priest 1346 3.69% Shadow 1104 3.03%    Holy 140 0.38%    Discipline 102 0.28%    Paladin 282 0.77% Retribution 182 0.50%    Holy 59 0.16%    Protection 41 0.11%    Hunter 30 0.08% Beast Mastery 19 0.05%    Marksmanship 11 0.03%    Survival 0 0.00%    [Xavian Stiletto] 34900 11.21% Rogue 20380 58.40% Combat 12846 36.81%    Assassination 4001 11.46%    Subtlety 3533 10.12%    Warrior 14520 41.60% Fury 6882 19.72%    Arms 4332 12.41%    Protection 3306 9.47%    [Gilded Thorium Cloak] 34491 11.07% Warrior 16787 48.67% Protection 14881 43.14%    Fury 1135 3.29%    Arms 771 2.24%    Paladin 9354 27.12% Protection 8022 23.26%    Retribution 1139 3.30%    Holy 193 0.56%    Druid 8136 23.59% Feral 7854 22.77%    Balance 165 0.48%    Restoration 117 0.34%    Hunter 101 0.29% Beast Mastery 70 0.20%    Marksmanship 31 0.09%    Survival 0 0.00%    Rogue 66 0.19% Combat 32 0.09%    Subtlety 24 0.07%    Assassination 10 0.03%    Shaman 24 0.07% Enhancement 24 0.07%    Restoration 0 0.00%    Elemental 0 0.00%    Warlock 23 0.07% Demonology 12 0.03%    Affliction 11 0.03%    Destruction 0 0.00%    [Mender's Heart-Ring] 26027 8.36% Priest 12562 48.27% Holy 8274 31.79%    Shadow 2502 9.61%    Discipline 1786 6.86%    Druid 6777 26.04% Restoration 4169 16.02%    Balance 2188 8.41%    Feral 420 1.61%    Paladin 2845 10.93% Holy 2174 8.35%    Retribution 507 1.95%    Protection 164 0.63%    Shaman 2210 8.49% Restoration 1485 5.71%    Elemental 552 2.12%    Enhancement 173 0.66%    Warlock 824 3.17% Demonology 308 1.18%    Affliction 284 1.09%    Destruction 232 0.89%    Mage 809 3.11% Frost 344 1.32%    Fire 273 1.05%    Arcane 192 0.74%    [Cincture of Will] 21528 6.91% Priest 12573 58.40% Holy 7746 35.98%    Shadow 2965 13.77%    Discipline 1862 8.65%    Druid 3369 15.65% Restoration 1704 7.92%    Balance 1494 6.94%    Feral 171 0.79%    Warlock 2026 9.41% Affliction 776 3.60%    Demonology 739 3.43%    Destruction 511 2.37%    Mage 1981 9.20% Frost 943 4.38%    Fire 558 2.59%    Arcane 480 2.23%    Shaman 991 4.60% Restoration 592 2.75%    Elemental 338 1.57%    Enhancement 61 0.28%    Paladin 588 2.73% Holy 473 2.20%    Retribution 94 0.44%    Protection 21 0.10%    [Cord of Nature's Sustenance] 20329 6.53% Druid 14490 71.28% Restoration 7412 36.46%    Balance 6263 30.81%    Feral 815 4.01%    Shaman 3901 19.19% Restoration 2463 12.12%    Elemental 1171 5.76%    Enhancement 267 1.31%    Paladin 1938 9.53% Holy 1538 7.57%    Retribution 322 1.58%    Protection 78 0.38%    [Terestian's Stranglestaff] 15434 4.96% Druid 15383 99.67% Feral 14846 96.19%    Restoration 272 1.76%    Balance 265 1.72%    Hunter 18 0.12% Beast Mastery 18 0.12%    Survival 0 0.00%    Marksmanship 0 0.00%    Priest 12 0.08% Holy 12 0.08%    Shadow 0 0.00%    Discipline 0 0.00%    Warlock 11 0.07% Affliction 11 0.07%    Destruction 0 0.00%    Demonology 0 0.00%    Mage 10 0.06% Frost 10 0.06%    Fire 0 0.00%    Arcane 0 0.00%    [Shadowvine Cloak of Infusion] 9712 3.12% Priest 3541 36.46% Holy 2117 21.80%    Shadow 938 9.66%    Discipline 486 5.00%    Druid 2090 21.52% Restoration 1035 10.66%    Balance 941 9.69%    Feral 114 1.17%    Mage 1150 11.84% Frost 465 4.79%    Fire 429 4.42%    Arcane 256 2.64%    Shaman 1107 11.40% Restoration 628 6.47%    Elemental 333 3.43%    Enhancement 146 1.50%    Warlock 922 9.49% Demonology 379 3.90%    Affliction 316 3.25%    Destruction 227 2.34%    Paladin 798 8.22% Holy 570 5.87%    Retribution 186 1.92%    Protection 42 0.43%    Hunter 104 1.07% Beast Mastery 68 0.70%    Marksmanship 36 0.37%    Survival 0 0.00%    [Fool's Bane] 9153 2.94% Shaman 4890 53.43% Enhancement 4745 51.84%    Restoration 87 0.95%    Elemental 58 0.63%    Rogue 1916 20.93% Combat 1387 15.15%    Subtlety 478 5.22%    Assassination 51 0.56%    Warrior 1879 20.53% Protection 858 9.37%    Fury 817 8.93%    Arms 204 2.23%    Paladin 468 5.11% Protection 303 3.31%    Holy 97 1.06%    Retribution 68 0.74%    [Breastplate of the Lightbinder] 8679 2.79% Paladin 8679 100.00% Holy 6800 78.35%    Retribution 1297 14.94%    Protection 582 6.71%