I think I would like to see them become the new mutation theme. While they would be initially weak. The longer they stay alive; the more adaptive they become to the situation. Think of them like an organic hive-mind that gets tougher, and tougher the more you try to kill it. Inspiration/Examples The Flood: Halo The Zerg: Starcraft Adaptive Mutation: When this unit is destroyed, all champions with Race: Myx will gain an additional resistance to that damage type that destroyed this unit for duration X. Hopefully they would end up, death benefit/adaptability style to them. Inherently cheap, with lower than average stats, being reliant on disposable units so that the race as a whole can get slowly buffed with defensive adaptations, while you have the support units in the back using Mutate: to get key units up, and running. When I say lower than average stats, I mean it. Cheap, swarm, adaptive. Possibly getting as low as 10hp for the disposable, and as high as 25-30 for the fighters. The Faction Bonus, and Adaptive Mutation stacking resistance will go far to make them hard to take down. Their low hp is to off set their cost, and balance out these high defenses. The themes weakness would be anti-summon, affects they bypass defenses. NO: Surge! This is a boosting theme, not a swarm theme. It just borrows the swarm mechanics to boost their theme. This would just be a theme with a rather eccentric playstyle. (Like constructs, but with a death benefit) I think it would fit the mutation role, and excel with SL's defense oriented faction bonus, making them viable. Ideally if it happens the way I envision. You can contest, and be semi-aggressive with the disposable units that will be used to buff your attackers for a duration. I don't think it would be a very boring gameplay. Will add more to this as time allows.