Wu is going to be helpful most of the time. I would continue doing 4-1 (Wu + the four colors that are strongest against the titan). Only exception for Wu is when youāre fighting a titan that reflects yellow damage (your Wu will probably die before being useful).
Obviously when stacking, you are largely at the mercy of the tiles.
Letās say youāre going against a green titan. Iād go Wu + 4 reds for sure. Wu with BT, Gormek, Kelile, and Colen should be a fairly strong combo. Though in that case, you really want to maximize use of your red tiles.
For best results, BRING MANA POTS
If you get a good starting board with lots of red tiles, use mana pots to charge up and activate Wu before using the red tiles. Try to look for any opportunity to match up 5+ red tiles in a single chain to produce a shard (AKA "diamond), that way you can unleash all of your reds on your board against the titan.
If you get a mediocre starting board with a few red tiles but spread far apart from each otherā¦ if you have tornadoes or hurricanes and can afford to use one? Go ahead and charge and activate Wu with your mana pots first, then use the tornado/hurricane to remix the board and hope that the tiles move closer together for more opportunities for red matches.
If you have a bad starting boardā¦ very few red tiles? Just stun the titan with other colors (particularly yellows if you can). This will keep the titan from being able to strike you, while also clearing bad tiles off your board while you wait for good ones to replace them. Donāt waste mana pots on Wu until you have enough red tiles up to do some significant damage.
Itās still entirely possible that your boards will be really bad, and there will be times where your Wu will miss most of his attacks, and you will end up with a lower score regardless of how hard you try. There are a few attack booster heroes that might be better than Wu (Tarlak, Miki, Ranvir to name a few)ā¦
and like @diesdas says, attack boosts can oftentimes stack even with Wu (BT is great vs. green titans)ā¦ defense debuffs help as well (Gormek, Wilbur also great vs. greens especially)ā¦ even if you didnāt have Wu (or actually especially if you donāt have a Wu-like hero, definitely want to focus on stacking + attack for your team coupled with - defense for your enemy)ā¦
heavy color stacking is almost always the best course of action for most titans, even though that comes with a degree of riskā¦ not every single hit is going to be a home run, sometimes the boards simply do not deliver. The point is to make the absolute most of the ones that do. You can get 3 mediocre scores running a full rainbow team, or you can get 2 awesome scores and 1 mediocre score using Wu + color stacks. Majority of the time in my experience, the Wu + stacking is going to give you the highest overall total score.
EXAMPLE: Letās say youāre hitting a green titan. You have Wu-Gormek-BT-Kelile-Colen on your team.
Match up 5 reds to create a shard, wait until you have a number of red tiles on your board and all of your special skills are fully charged.
Use your specials in this order:
Boldtusk, then Gormek, then (edit: probably Colen before Kelile, because Iām not sure if DoT stacks), then Wu, then activate that red shard on your board.
Of course, there are factors, such as titan level, how many of Wuās hits actually hit, or whateverā¦ but on average, a hit like that should net you well over 10k (potentially upwards of 50k or more?) damage.
And thatās just one hit. If you can pull that off twice, or if that hit is followed by a major chain comboā¦ just sit back and enjoy.