Legacy of Vaal large soul stone

I got the quest for legacy of vaal act 3 cruel to get a large soul stone to pun on an altar, i got the large soul stone and i think i droped to rearage my inventory or something and i couldent get anymore another large soul stone and now i`m stuck, i tryed the map reset for like 7-8 times and nothink, anyone know a soultion please let me know.

same

I solved that. When you reset area go kill all the mobs and find 2 medium soul cores. Use them as in previous quest ( there are two circle for them ) and than ONLY it will change the core in the wall ( near Alva) may take a min for energy to come from the generators you used to the middle.