no, 30 poison. 5 per scorp, 6 scorps.
Table:
1: 0 poison/turn. 0 poison x 1 scorp
2: 2 poison/turn. 1 poison x 2 scorps
3: 6 poison/turn. 2 poison x 3 scorps
4: 12 poison/turn. 3 poison x 4 scorps
5: 20 poison/turn. 4 poison x 5 scorps
6: 30 poison/turn. 5 poison x 6 scorps
The formula is: PT = ( I - 1 ) x CS, where PT is poison/turn, I is imortal creatures, and CS is crystal scorps. So, as an example:
6 crystal scorps, 6 Immortals, and 6 Phase Dragons:
PT = (18 - 1) x 6
PT = ( 17 ) x 6
PT = 102 poison damage per turn. Very painful.