- changed formula for undead cost from (2 + number of undeads * 4) to (2 + number of undeads * 7)

- increased cost of lvlup from 6 to 7
- fixed: volume adjustment for sfx

- Presence of the Bony structure: percantage dmg reduced 40/80 -> 30/60

- Blood Lightning: damage reduced: 30/40 -> 15/30