This UM is one hell annoying. Resist x3 , block x3
At this low agility, only Shulk have enough accuracy to hit Abaasy after the start battle buff turns off. Unless he triggers agility down gem debuff, the party is going to miss a lot.
Yea my Dunban have yet to link with 10 agi from Sharla but that wont be enough. The AI sometimes too stupid to stay behind the enemy to benefit back attack accuracy bonus from Bulls eye. He sometimes do not activate serene heart to add more accuracy..
Shulk can link with Dunban's Reckless Abandon to add more agility. Couple with back attack accuracy bonus by linking with Riki's Bullseye. Careful though, Abaasy can sometimes use demon Purging flame without triggering vision. At half hp, it can kill Shulk+ monado armor. Use light heal before hand.
As you can see i decided to be greedy and tried to side attack Abaasy before chaining so that i can get slit edge physical def reduction in chain attack. Sadly Shulk attack start to miss...twice in chain attack. As much as i wanted to start chain with shadow eye, that split second topple duration is more valuable than adding Shulks dps. Sometimes Abaasy shift agro to Shulk after chain attack so its good to have Shadow eye standby.
Abaasy have 1/2 topple duration so chances your party will not be able to topple lock it most of the time. Monado Armor provides cover and worst case scenario, Reyn's last stand is on standby.