From Diablo Wiki
Trigger: Click on the Nephalem Monument
Completion Details: Defeat the enemies of the Nephalem spirits.
Upon clicking on the monument, a group of Nephalem apparitions spawn, and begin re-enacting their final battle. When the last nephalem gives a battle cry, ironically, they disappear, leaving the hero to clean up the mess.
The enemies come in waves. The first wave will be a few skeletal returned with ghouls. The second wave will be a larger number of ghouls. About four enraged phantoms will spawn with the third wave, along with an increasing number of ghouls. The phantoms are capable of hitting the player with a snare attack, slowing their movement speed, but the fighting area for this event is not very large.
Once the third wave is complete, the event will automatically end.
The monument, under normal circumstances, can be very hard to spot. It is simply a stone panel in the ground, with a similar colour composition to the rest of the Festering Woods. However, like for the Last Stand of the Ancients event, when a player is in close range to the stone, a yellow pinging marker will display on the minimap to inform the player that it is in the area.
Eternal War is in some way involved in the following achievement(s).
| Eternal War
|10||Complete the Eternal War event.||No Award|
| Eternal War (Cooperative)
|10||Complete the Eternal War event in a cooperative game.||No Award|
Eternal War can appear as a Bounty.
A video of the event:
|Quests & Events of Diablo III  Act I Act II Act III & Act IV Act V|
|Act II Quests||Act II Events |
|Quests Act III||Events Act III||Quests Act IV |
|Achievements General Campaign Cooperative Hardcore Classes Challenges Crafting Feats of Strength|
• Level 10 *
• Demon Hunter
• Stop Hitting Yourself
• Made to Order *
• Return Business *