From Minion Masters Wiki
Guardian's shield has lower priority than a shielded units’ special mechanics. The following abilities will trigger even when the Minion is shielded by Guardian:
- Guardian was available since Update 27 - The Tri-Team Tourney! (3 May, 2017) trough an event and was officially released in Update 29 - Give it up for Team Brawny! (17 May, 2017)
- In Update 38 - A Moment of Peace (26 Jun, 2017) Guardian's shield ability was changed to not prevent building decay anymore.
- In Update 42 - Hear me Roar! (23 Aug, 2017) Guardian's shield ability priority was reduced so that other minions abilities still trigger when they are guarded.
- In Update 76 - Avatars and much more! (12 Sep, 2018) Guardian was changed to no longer protect any buildings other than the Master Tower.