NightShade Nest and Slime Lord in Soulkeep

I have tried slime lord with charnel pit and it proves that it is a good tower and as it is not a full attacking one this means that we should not use it but it was amazing and has a great effect when it is used alone it is not that but when using just before tower it would do a good work.

I have used Slime Lord again but with tower that is slow like nightshade nest which has a slow fire rate and I want to see what Slime lord could do with a tower that is slow not like charnel pit that was fast and it is alone can do a good work and kill fiends.

In fact Slime Lord enhance the ability of Nightshade more to attack and to do its magic but still not fast as I expected as some fiends could escape from this trap that I have made using these towers which are Slime Lord and Nightshade nest so I want to think outside the box and this by using a spell.

What if I have used Gear Grease Spell that its main job is to increase the fire rate of Towers that are slow so my next plan is to try Gear Grease to enhance the tower efficiency and to be able to attack fiends faster and not let any of them escape and go to the gate and this would be a combination of spell and tower as secondary weapons against fiends.