110 Animal Taming & Animal Lore allow you to control most (if not all) tames available on Enigma. Necromancy provides many options that allow you to adapt to your situation. The Wraith Form necromancy spell is one of the most commonly used forms as it provides a mana leech for damage you deal (based on your Spirit Speak skill). Necro tamers excel using Wraith Form in champion spawn/rift style events where you can use your pet to grab aggro & tank mobs while you use the Wither spell to deal massive AOE cold damage.
At 100 Animal Taming & Animal Lore, using 2 Demon Wargs have a decent mix of DPS and tankiness. They also have a whirlwind special ability that'll make quick work of adds, especially when using Wraith Form and Wither to stack AOE damage.
At 105 Animal Taming & Animal Lore, it is generally recommended to use an Obsidian Dragon for encounters when a tank is needed. Obsidian Dragons require 5 control slots, have a ton of health, and are absolute tanks! But, they don't do as much DPS as other pet combinations.
You have 3 options to bond your pets:
After your pets reach level 5 you can add a runestone to your pet to give it an additional ability. The Life Eater runestone works as it sounds, it steals life allow your pets to survive a bit longer.