I used this code awhile back to buff pets so change it around to reduce them.
Code:
update npc_types set hp = hp * 2 where id > 499 and id < 529;
update npc_types set mana = mana * 2 where id > 499 and id < 529;
update npc_types set mindmg = mindmg + 5 where id > 499 and id < 529;
update npc_types set maxdmg = maxdmg + 10 where id > 499 and id < 529;
update npc_types set mana_regen_rate = mana_regen_rate * 2 where id > 499 and id < 529;
update npc_types set hp_regen_rate = hp_regen_rate * 2 where id > 499 and id < 529;
update npc_types set hp = hp * 2 where id > 540 and id < 641;
update npc_types set mana = mana * 2 where id > 540 and id < 641;
update npc_types set mindmg = mindmg + 5 where id > 540 and id < 641;
update npc_types set maxdmg = maxdmg + 10 where id > 540 and id < 641;
update npc_types set mana_regen_rate = mana_regen_rate * 2 where id > 540 and id < 641;
update npc_types set hp_regen_rate = hp_regen_rate * 2 where id > 540 and id < 641;
update npc_types set hp = hp * 2 where id > 745 and id < 771;
update npc_types set mana = mana * 2 where id > 745 and id < 771;
update npc_types set mindmg = mindmg + 5 where id > 745 and id < 771;
update npc_types set maxdmg = maxdmg + 10 where id > 745 and id < 771;
update npc_types set mana_regen_rate = mana_regen_rate * 2 where id > 745 and id < 771;
update npc_types set hp_regen_rate = hp_regen_rate * 2 where id > 745 and id < 771;
update npc_types set hp = hp * 2 where id > 783 and id < 824;
update npc_types set mana = mana * 2 where id > 783 and id < 824;
update npc_types set mindmg = mindmg + 5 where id > 783 and id < 824;
update npc_types set maxdmg = maxdmg + 10 where id > 783 and id < 824;
update npc_types set mana_regen_rate = mana_regen_rate * 2 where id > 783 and id < 824;
update npc_types set hp_regen_rate = hp_regen_rate * 2 where id > 783 and id < 824;
update npc_types set hp = hp * 2 where id > 836 and id < 854;
update npc_types set mana = mana * 2 where id > 836 and id < 854;
update npc_types set mindmg = mindmg + 5 where id > 836 and id < 854;
update npc_types set maxdmg = maxdmg + 10 where id > 836 and id < 854;
update npc_types set mana_regen_rate = mana_regen_rate * 2 where id > 836 and id < 854;
update npc_types set hp_regen_rate = hp_regen_rate * 2 where id > 836 and id < 854;
update npc_types set hp = hp * 2 where id > 893 and id < 923;
update npc_types set mana = mana * 2 where id > 893 and id < 923;
update npc_types set mindmg = mindmg + 5 where id > 893 and id < 923;
update npc_types set maxdmg = maxdmg + 10 where id > 893 and id < 923;
update npc_types set mana_regen_rate = mana_regen_rate * 2 where id > 893 and id < 923;
update npc_types set hp_regen_rate = hp_regen_rate * 2 where id > 893 and id < 923;