Key Skill Gems for Totem (Clear) Setup:

Sunder: Main damage skill, with modifiers that enhance damage, area of effect, and speed.
Martial Tempo: Boosts attack speed, making your Sunder totems faster and more efficient.
Upheaval: Adds additional fissures but lowers attack speed and damage, which is counterbalanced by Path of exile currency the massive damage scaling.
Inspiration: Helps reduce the mana cost of Sunder, which is essential for keeping up totem uptime.
Magnified Effect: Increases the AoE of Sunder significantly.

Key Skill Gems for Bossing Setup:

Sunder: Same as in the clear setup, but optimized for pure damage.
Concentrated Effect: Increases damage but reduces AoE, making Sunder very effective against bosses.
Brutality: Increases physical damage significantly, ensuring you hit extremely hard.
Heavy Swing: Adds even more melee physical damage at the cost of POE currency for sale attack speed.
Bloodlust: Increases melee physical damage against bleeding enemies (which you apply via Lacerate).