Skills

The primary focus of the build is around the Fire Spells and Lightning Spells trees. The primary fire skills you'll use are Fireball, Meteor, and Hydra. Additionally, you'll be utilizing Energy Shield and Teleport in the Lightning Spells tree. Cold or Frozen Armor ought to be used for further cc and defense.

Fire Spells

Fire Bolt (1+ points): This skill serves as a synergy for both Fireball and Meteor, increasing their damage.

Fire Ball (20 points): Your primary damage-dealing spell. Maxing this skill out will greatly improve your damage output.

Meteor (20 points): A powerful area-of-effect spell, helpful for taking down categories of enemies.

Fire Mastery (20 points): A passive skill that boosts the damage of all fire skills, required for maximizing damage.

Hydra (1 point): A great utility skill for providing additional damage against bosses as well as in PvP.

Lightning Spells

Telekinesis (20 points): Provides a synergy bonus for Energy Shield, increasing its efficiency.

Energy Shield (10+): The core from the ES build. However, maxing telekinesis is a higher priority.

Teleport (1 point): A must-have for mobility and survivability

Cold Spells

Cold Spells aren't the main focus of the build, however, you should allocate just one point to each of the following skills for utility purposes:

Frozen Armor (1 point and prereqs): A useful buff providing you with additional defense and it has a chance to freeze enemies on hit. Buying D2R Ladder Items and buying d2 resurrected runes can help boost your gear in D2R Ladder, which benefits physical damage dealers and specs that benefit from scaling.

Gameplay Tips:

1. Keep Energy Shield active all the time. It's essential to your survivability, and it is efficiency is increased by investing in Telekinesis.
2. Prioritize casting Meteor and Hydra when facing large categories of enemies.
3. Fireball is the primary damage-dealing spell, so utilize it frequently for both single-target and AOE damage.
4. Use Teleport for mobility and escape dangerous situations. Remember that the Enigma Rune Word offers the Teleport skill, letting you save skill points.
5. Don't forget to make use of Frozen Armor for further defense and crowd control.
6. Positioning is vital, so ensure that you keep your distance from enemies and utilize choke points when possible.
7. Don’t forget to enchant your Mercenary.