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Hey was wondering what the vote on if this is plausible: in an upcoming doubles tournament i was thinking of combos and what better than to make enemy squads move only 1d6 per turn. Could a thunderfire cannon fire a subterranean blast (making target squad count as moving through difficult terrain on their next movement phase) combined with "What was that?" on the Tyranid Deathleaper special rules saying that enemies within 12" roll one less dice when moving through terrain(to a minimum of one) work even if both armies couldnt cast abilities on eachother (say a tervigon casting feel no pain on a terminator squad is not allowed) thanks for any help and opinions

While the deathleaper/subterranean blast thing would work, the other one entirely depends on the rules of the tournament. Usually your skills can not be used on your allies units though, but if you can, catalyst on terminators is fair game.

THis isnt you using your rules on your allies, but on offensive powers both being used on the enemy.

i know its not the best combo ever so i probably wont use it but its good to know you dont all disagree thanks

It's different from you using Synapse on Terminators as it is an effect applied after shooting an enemy squad. I see no wrong in this.

It's two independent effects, both of which target an enemy units - this is fine.