Scripts/Instance: The Stonecore: Corborus, Slabhide

To share some work... Scripts up to Slabhide. Source is sniff file @Aokromes sent me.
Then it would summon trigger for each hit target? or not?
```
=== ID - 81035 Stalactite ===
Effect 0: Id 3 (SPELL_EFFECT_DUMMY)
BasePoints = 0
Targets (22, 15) (TARGET_SRC_CASTER, TARGET_UNIT_SRC_AREA_ENEMY)
Radius (Id 18) 15,00
```