Thunder shows off his high damage full meter combo. This combo makes use of a lot of Ankle Slicer Linkers as that is his primary damage building linker. If you try to use the Triplax Ender for a wallsplat before Instinct Cancelling you will actually end up with less damage overall. This is because Call of the Earth is Thunder's Damage Ender.

Here's how it's done:

Horn Breaker --> Heavy Ankle Slicer --> MK --> Heavy Ankle Slicer Linker --> HK --> Heavy Ankle Slicer Linker --> Call of the Earth Ender --> Instinct Cancel at 15 hits --> Shadow Ankle Slicer --> Shadow Ankle Slicer --> HK --> Heavy Ankle Slicer Linker --> HP --> Heavy Ankle Slicer Linker --> HK --> Heavy Ankle Slicer Linker --> HP --> Heavy Ankle Slicer Linker --> Call of the Earth Ender

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