How would i add morrowind creatures to wild in cyrodil

This is exactly why I wanted everything in the Master, so that you could do stuff like this easily. 1. Open the CS and double-click on Morrowind_ob.esm 2. Drag and Drop your creature anywhere you want to 3. Save as a new mod. Opening Morrowind_ob.esm automatically opens Oblivion.esm. The mod now uses both Oblivion.esm and Morrowind_ob.esm as Masters, so you can mix/match between them.

Silt Striders are Activators, not Creatures.