Sunder is a powerful melee slam move that creates a rolling fissure that hits areas in POE2 Currency sequence, dealing relatively high area damage as it travels. On top of this, some of the enemies hit by the fissure will also release shockwaves that can damage other nearby enemies.
Since the fissure rolls, the damage of the move isn't instant and will take a while to hit distant enemies. That means it can be difficult to use on mobile ranged foes, but it's still a highly effective skill.
Heavy Stun
For Warrior builds that want to focus on stun buildup, Boneshatter will help with area damage and mob clearing. When enemies accrue enough stun buildup from other Warrior skills and effects, they become "primed" for stun.

Hitting a primed enemy with Boneshatter deals heavy stun and releases a shockwave that deals 250% base damage in an area. This means that Warriors focused on this type of damage can focus on stunning single targets and rrelyon this skill to spread the damage to multiple foes.
Hammer Of The Gods
Unavoidable Burst Damage
Hammer of the Gods is one of the strongest moves in the Mace skill tree. The 24-second cooldown of the skill is offset by a base damage multiplier of 1441%.

Using the move manifests a giant hammer above the target area, which falls after a short time, dealing massive AoE damage. The activation delay does mean that enemies can move out of the target area and avoid damage, so the skill has to be used wisely, but the damage can't be evaded based on just the enemy evasion rating.
Fire Damage:  Build Assistance
Since every character will have at least 30 spirit to play with after defeating The King in the Mists in Act 1, even Warriors should have a persistent buff skill active. The most helpful persistent buff for the Warrior is probably the Herald of Ash. It's more effective for builds that spec into fire damage, but any Warrior can use it.
This buff causes enemies that are overkilled (hit for additional damage equal to at least 20% of their max life value when killed) to explode and deal fire damage in an area that can also ignite foes. Since Warriors will often focus on high single-target damage, this can be very useful for spreading damage and elemental ailments around when mobbing.
Volcanic Fissure: Molten Slam
Volcanic Fissure is another combo slam move that works in a similar way to Earthshatter. Volcanic Fissure fire-damage ffocused creating a winding fissure that deals AoE fire damage as it travels.

Fissures stay on the ground for 12 seconds, and hitting them with another slam attack creates aftershocks, which also spread to other connected fissures. This move works well for area damage if players are focusing on fire damage for their Warrior build.
Damage And Mobility
Leap Slam is a move that anyone who's played a Warrior, Barbarian, or any other melee slam specialist in any ARPG will recognize. It's as straightforward as players would as'sUme, causing the Warrior to leap toward a target area and slam the ground, dealing AoE damage and knocking back enemies.

The damage isn't quite high enough to use this move as a main damage-dealer, but the additional mobility that Leap Slam provides is great for getting the Warrior to where they need to be to deal their melee-focused damage.
Supercharged Slam: Wind-up Knockout Slam
The charged slam of Supercharged Slam is a channeling move that gains stages the longer the button is held. At 3 max stages by default, this takes the damage of the resulting slam to 444% base damage when fully charged. Fully charged slams also release aftershocks for additional area damage.

This makes Supercharged Slam a very high-damage move in circumstances where the player has time to charge it. The long charge time for maximum damage makes this one difficult to use in a lot of PoE 2 boss fights for single-target damage, though.
Perfect Strike: Charged Fire Waves
Perfect Strike is a high-damage potential move, but it takes some practice to pull off the perfect timing consistently. Channeling the move and releasing at the moment of full charge causes a wave of fire that deals 570% base damage, with 80% of physical damage converted to fire damage.

However, mistiming the move deals a normal fire wave with buy Path of Exile 2 Currency less range that only deals 142% base damage. This is a very strong move for fire-based builds in Path of Exile 2, but only if players can master the timing.