So its kind or a double edge sword. If you don't want to make an REM but want to tank play run. If you only want to make one REM for pld make aegis. Kensagaku is correct that priwen is a better shield then ochain since in newer content you have to use reprisal on both to increase the block rate. Priwens block rate isnt as good as ochains but it negates more dmg due to having more defense so overall it negates more dmg.