Got 2 and 3-star Red Alert. Also found my first 4-star combat, who happens to be Ravage, which is amazing. Now all 3 obtainable Ravages are in my war squad (current power - 21k). Only had enough spark to get him to level 5, but he already has more HP than a level 59 4-star gunner and half DPS of a normal bot.
But the best part was G-metal cores. The first one was a duplicate of my HQ beam, so I fused it and a silver core into another one, finally reaching level 20. The core I got from that was flame for mortars, which is exactly what I needed. And the remaining amount of shards was exactly enough for the third core, a laser ricochet.