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For better dealing with summoners I recommend “Zephyr’s Cut”. It’s designed to go approximately around the area where they move and with correct movement you can kill them in around 12s with lvl 1 upgrade
Mjornir Jr. is great to quickly get rid of foes summoned by the skeleton mage so if you get it you can just treat the summoner like source of EXP
Movement speed is also great since it allows you to dodge the summoned minions and go straight for the summoner.
If you get possessed by the armored skeleton and don’t have enough upgrades to deal with the summoner I would just ignore them. Knockback and bigger range should keep you save from the summons for a while
If you manage to get through that, there are 2 mobs with abilities that are great for dealing with summoners quickly.