My Towers for Level 2 in Soulkeep

I have joined soulkeep from few days and it was amazing experience as I was able to pass first level and for level 2, I am on my way to pass it as it is not easy but I have tried some good towers that could help with some modification.

First tower is Gloom Owl and in fact this is the only tower that I have no plan to change it as it is amazing in attacking low health fiends and show amazing effect against them.

Gloom Owl is a fast tower also and has a good physical damage and second card that I have chosen is Ivory tower which has fire interval of 4.5 and physical damage of 700 and this is huge number when I read and compared it to Gloom Owl.

Last tower I have to choose is Nightshade nest and I do not have idea what this tower could do n the battle but I wanted to know how this tower can attack fiends as its shape and attracted me so I want to know what this tower attack and how.

Finally Spell that have opened to me and I liked it which is stew of doom and I have used it and see the explosion that it has and they could kill most of fiends that stepped on it so I used it again.