Invisibility for the Town Hall.

I like how they handled the stalker invis in the TE mod – they replaced it with retaliate. It’s quite logical; the items are practically equivalent, but retaliate always works, while invis allows you to easily deal with neutrals. Otherwise, warlocks are too dominant at the start, not to mention the hit-and-run tactic, which has become much more effective with them. And that’s not even mentioning what will happen if a warlock manages to max out their battle skill...