Upon defeat of all three Vanguards, the vanguard judgement will appear on the ground, giving the player some insight as to how the Vanguard came to be.
The three Vanguards originally spawn underground. When a player gets near one of the holes, all three will burst from the ground.
All Vanguards attack three times with each attack; however, the magic and ranged Vanguards use AoE attacks (one always hitting the player while two are launched elsewhere). The melee Vanguard simply attacks the player three times for every attack it performs.
To harm the Vanguards, damage must be spread equally to all three Vanguards. If just one of the Vanguard is heavily damaged while the others have much higher health (at least 34% or higher), all the Vanguards will heal themselves back to full health upon shuffling. To stop this from occurring, the Vanguards' health must be within 33% of the other Vanguards by the time they shuffle positions. Stomp damage is applied to players under them when they shuffle; this damage will not occur when they attack players.
It should be noted that the ranged Vanguard is static, and will be unable to attack players that are under it. The melee and magic Vanguards will attempt to move out if the player is under them. In addition to this, if a Vanguard reaches 0 health at the same moment it shuffles, it will restore 1 health rather then dying.
The Vanguard seem to have very high defence, so using Verac's armour set may be useful in killing them quickly.