Sacred 2:The Nameless Guardian

Damage Done:

Weak against:

Battle Notes

There are four Guardians, each with his own strengths and weaknesses (check the images below).
The first one does Physical and Magic, the second Physical and Fire etc. Committing to memory the order of the elemental damages that each Guardian will produce can be a strategy. A player can use his relic holder to flip up the correct element to properly shield, as much as possible, the specific elemental damage that a Guardian is dealing out. A player, for example, encountering the first Guardian which deals Magical damage would make sure that his magical (blue) relics are facing upwards on his relic holder
The Poison Guardian has the largest amount of healthpoints amongst all the Guardians, a significant and larger difference from the others
Tip to defeat: Lure it out of the door. The Heart of the Machine will not be able to assist it (giving its shield, attacking you), it is then much easier to defeat (but might cause a bug which will prevent other Guardians from waking up).

These are the levels at which this monster can spawn at each difficulty level: