Punching the pots/plates in Ca'our's room triggers the "Triumphant Rush" weapon damage buff. This is actually super useful for DPS if you're doing Wardcliff strat as there's a bunch of pots up on either side of the boss plate.
Discovered this with my clan last night and it ended up being super helpful. Easy one-phase if you have Melting Point and an Empowering Rift.
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Just use warcliff coil in phase two, you will kill him in your first run with ease, just ensure everyone kills an enemy or pot with a melee before hand, expect for any arc striders, have them shoot something instead.