In Lords Mobile Trap Retrieval I research allows you to save some tier 1 wall traps from being destroyed. This research saves a percentage of your traps after an attack on your turf. It is found in the upgrade defenses tree.
There are 10 levels and once maxed 50% of your tier 1 wall traps will be saved after each attack. You can repair your saved traps in your Castle Walls.
The table below has the resource cost and time to upgrade each level. It also shows the might and rewards granted. You can find out your own research time by using our research calculator.
Trap Retrieval I Research Requirements
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