I have never found a relic in this game that was worth activating and many are nerfed, bugged or buff the wrong attribute, check this list
I only use Bonnie defense relics which give 6% but this should be 12% anyway (another bug)
http://pirates.playtamin.com/artefacts.html
2 Davy Jones relics only add 10% Rum (which should be 30% - Bug)
Many boost marauder defense or chinese unit offense so are worthless
http://prntscr.com/h4wgmv
http://prntscr.com/h4whb2
The entire list needs a lot of work, but our devs will never bother - Let them sleep ... they have much more important things to do, like destroying our brotherhoods
Dozens of relics need fixing, but they chose to tinker with the only one which nobody seems to use
Fixed: Only the correct Units are now affected by the Magic Anvil Relic. - http://prntscr.com/h4wxev
I am still waiting for a FREE method to unlock relic slots on Gold Coast and Sirens Strait - http://prntscr.com/h50x7b
I have no wish to create Alt Accounts to unlock them, nor in the Pirate Den - http://prntscr.com/h50z2o
This forum also needs work because many links are not clickable - you need to cut and paste to visit PLAYTAMIN
There seems to be some conflict between http and https
http://pirates.playtamin.com/artefacts.html
pirates.playtamin.com/artefacts.html
http://prntscr.com/h4wmds