You can put these into one of your "eastwastesshard.txt" map file for spawn points of "a fear shardling", "a nightmare", "a samhain", and "a spinechiller spider". They don't roam, and they don't have variation (they'll always be the same mob type).
As was mentioned elsewhere, don't bother with the amygdalans. They don't drop them.
The "f" is for "fear" (or perhaps another four-letter word you might be uttering by the time you get your "Invisible One", the bottleneck for this set).
P -2053.0281, 5103.0645, 149.2547, 0, 0, 0, 1, f
P -3112.4656, 4371.4551, 188.2960, 0, 0, 0, 1, f
P -4243.6084, 4127.1104, 162.2638, 0, 0, 0, 1, f
P -4233.8838, 4786.1792, 154.6201, 0, 0, 0, 1, f
P -4837.1001, 5120.5186, 151.6292, 0, 0, 0, 1, f
P -5201.0645, 5299.8545, 180.1259, 0, 0, 0, 1, f
P -4509.8965, 5819.6392, 144.4725, 0, 0, 0, 1, f
P -3826.6587, 7165.0508, 173.1158, 0, 0, 0, 1, f
P -4440.3892, 8050.3223, 164.2547, 0, 0, 0, 1, f
P -4667.8975, 8762.5596, 148.5571, 0, 0, 0, 1, f
P -4771.7715, 8210.5225, 144.4892, 0, 0, 0, 1, f
P -4904.4092, 8392.4463, 155.3321, 0, 0, 0, 1, f
P -5278.2437, 8699.7813, 203.1278, 0, 0, 0, 1, f
P -5255.9053, 7588.0044, 234.4868, 0, 0, 0, 1, f
P -2105.5745, 7994.0093, 196.3806, 0, 0, 0, 1, f
P -1289.2222, 7912.3008, 213.4353, 0, 0, 0, 1, f
P -394.3700, 8491.4688, 147.6648, 0, 0, 0, 1, f
P -134.8791, 8316.1641, 179.3271, 0, 0, 0, 1, f
P 699.0566, 7760.6436, 180.4656, 0, 0, 0, 1, f
P -78.6946, 6720.4600, 181.3707, 0, 0, 0, 1, f
P 1404.9572, 8594.2676, 177.4784, 0, 0, 0, 1, f
P 2543.6851, 8315.0264, 188.9894, 0, 0, 0, 1, f
P 4709.3804, 7634.7896, 145.2305, 0, 0, 0, 1, f
P 5112.9229, 6897.0728, 68.7667, 0, 0, 0, 1, f
P 4714.4854, 6374.1641, 150.3698, 0, 0, 0, 1, f
P 4485.6514, 5577.5752, 144.4655, 0, 0, 0, 1, f
P 4353.2061, 3703.9485, 144.4561, 0, 0, 0, 1, f
P 4667.3638, 2216.2151, 147.8948, 0, 0, 0, 1, f
P 3797.7261, 2313.6353, 169.9194, 0, 0, 0, 1, f
P 2976.9893, 1827.2516, 168.3069, 0, 0, 0, 1, f
P 2540.0867, 636.9944, 181.0596, 0, 0, 0, 1, f
P 1742.1758, 1124.1161, 207.0616, 0, 0, 0, 1, f
P 943.1471, 1550.7078, 241.9491, 0, 0, 0, 1, f
P 832.5246, 929.3342, 151.8755, 0, 0, 0, 1, f
P 15.0701, 1708.7095, 149.1264, 0, 0, 0, 1, f
P -58.1852, 636.4563, -0.7643, 0, 0, 0, 1, f
P -2959.2305, 2993.5767, 213.3974, 0, 0, 0, 1, f
P -5170.3799, 959.7566, 408.1756, 0, 0, 0, 1, f
P -5073.9556, 155.0079, 295.3418, 0, 0, 0, 1, f
P -4233.2603, 55.6661, 305.1410, 0, 0, 0, 1, f
P -4691.7813, 2019.9689, 319.8533, 0, 0, 0, 1, f
P -4120.3643, 2871.5828, 164.1680, 0, 0, 0, 1, f
P -3394.1956, 8962.3467, 179.6943, 0, 0, 0, 1, f