If you lock your WCRUX in the stake for 7 days, you will get the benefit of a 5% reduction to your damage received in Tier 1 fleets. If your fleet is Tier 2, you will get the benefit of a 20% reduction on your damage received.
If you lock your WCRUX in the stake for 15 days, you will get the benefit of a 15% reduction of your damage received in Tier 1 fleets. If your fleet is Tier 2, you will get the benefit of a 50% reduction on your damage received.