I farmed a set of guardian and sentry for an alt bard and alt rogue about a month in to velious. Anything that drops guardian also drops sentry. I mostly farmed between zone in (not the first 2 after nerf) and the fountain area. I went as far back as the bank. They all could drop it.
I am not saying these are the only guys that dropped it, but confirming that they definitely did and they definitely dropped both.
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