[@Duthguy][@malmshodes]

So here is the plan in a nutshell.  Zypha is the only one with essentially grappling hooks so can manage to reach the roof with a little trickery.  She will go to the tree closest to the base, of course the tree is too far normally to reach the roof, otherwise that would be a pretty bad base design, and trick the marines into firing at the base of the tree with one of their cannons.  The tree will topple over toward the base, on which Zypha will charge up and with a little chain-scythe magic manage to leap on the roof to do battle, allowing your two characters to make it inside without being blow to kingdom come.

Sound like a plan?