May i suggest making the hellhound one more powerful? like spawning 5 hellhounds?
I tried to use your MobArena Wave editor, but the "save as" button doesnt work :P
I had a error; "An internal error" thingy, and i looked at the console, and it said that It was clashing with Spout, so i rmeoved spout and it...
Exact same bug with me.
Separate names with a comma.