If you have the season ticket I would make like a final boss where when the boss gets hit he disappears and reappears with less health
what device does that?
Maybe make them disappear and make a new one appear in a different place
so just more then one sentry?
like have a bot appear then have it a one shot but no reward and then another in a different place and keep disappearing until the last one disappears then they get a key but every time the bots disappear health slowly increases
yes I would think that is the only way to do it
alright 
what do you think 
im going to make it a small boss (mini boss)
nice thanks for listening I am still new just so you know
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no problem