Note that several entities are left over from Book II (Dwarven Spirit, Brimstone Spider, Lycanthrope, etc.) and some have never been used (Liche). These may not work correctly.
Also note that Lava Slag and Mutated Assassin Stalk share the same entity number. The game evidently uses the first entry with a given number, so if you put entity 99 on a map, it'll be a stalk, not a slag.
Bog Roach 1 Cave Scorpion 2 Stinging Swarm 3 Golden Matron Roach 4 Salted Fungus 5 Bloodborn Rogue 6 Marauder 7 Blue Nidaria 8 Mist Wolf 9 Lancer Spider 37 Cursed Undead 10 Sentinel Stalk 11 Umbra Dog 12 Dwarven Spirit 13 Deathbringer 14 Liche 15 Phoenix 16 Dreadbellow Troll 17 Skeleton Marauder 18 Skeletal Archer 19 Brimstone Spider 20 Fetid Grubb 21 Fetid Grubb Maggot 26 Lycanthrope 22 Akadai Dartflinger 23 Akadai Fishgutter 24 Goblin Soldier 27 Goblin Archer 28 Goblin Bombthug 29 Daedrotha 30 Scrylexus 31 Spineback Basilisk 33 Scarlet Death 34 Stone Golem 36 Bruiser the Blacksmith 35 Mutated Assassin Stalk 99 Lava Slag 99 Taurax Scout 38 Taurax Legionnaire 39 Taurax Spearmaster 40 Malgaelor 41 General Ghorr 42 Graven Idol 149
Akadai Kingspawn 25 Morwen 100 Seamus 101 Arima 102 Leisle 103 Lilith 104 Logi Mooredux 105 Off-duty Miner 106 Shelta Marie 107 Kirk 108 Mitza 109 Shepherd Nickolas 110 Tavern Patron 111 Ranimer 112 Ranger 113 Alywin 114 Dannia 115 Madam Gilda 116 Baelgar 117 Akadai Kingspawn 118 Valx Grayraven 119 Shrock 120 Erubor 121 Baizel 122 An injured man 123 Atrox Deep Prisoner 124 Crazy Bernard 125 Erubor 126 Lilith 127 Alexx 128 Magpie 129 Captain Morgan 130 Waylen 131 Barrean Clansman 132 Barrean Loyalist 133 Karamiklan 134 Alundar 135 Lucky 136 Dwarven Loyalist 137 Edgar 138 Dark Steel Mercenaries 139 Xaphus 140 Barrean Gatekeeper 141 Town Guard 147 Caravan Guardsman 148