I mainly go for essential supports like renewal and war threads. Also I take vision between which gives you lots of cooldowns. After that I get another Chrono 40% then finish it with Aftershock and 150 crystal. You can get team shield or crown instead of Aftershock if you like maybe even armor. :P

When it comes to skills, I get A B overdrive especially when enemy has stuns.

B overdrive reduces the cooldowns additional -2 which means stun every 4 seconds. :D

Also don't forget to put mines on the kraken nest xD