Here are the logs for my level 24 Cleric going against a level 25 Mob,
https://wiki.project1999.com/Deputy_Keld . He is a yellow, and a bit of an undercon for his level. Obviously I would be hitting a blue mob more often. Please note I did slow the mob on my 60 Shaman so I wouldn't have to worry about dying:
[Wed Feb 03 18:48:19 2021] Auto attack on.
[Wed Feb 03 18:48:20 2021] You crush Deputy Keld for 16 points of damage.
[Wed Feb 03 18:48:20 2021] Deputy Keld kicks YOU for 2 points of damage.
[Wed Feb 03 18:48:20 2021] Deputy Keld tries to pierce YOU, but misses!
[Wed Feb 03 18:48:22 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:48:24 2021] You crush Deputy Keld for 14 points of damage.
[Wed Feb 03 18:48:27 2021] You try to crush Deputy Keld, but Deputy Keld dodges!
[Wed Feb 03 18:48:29 2021] You crush Deputy Keld for 48 points of damage.
[Wed Feb 03 18:48:31 2021] You crush Deputy Keld for 16 points of damage.
[Wed Feb 03 18:48:32 2021] Deputy Keld pierces YOU for 28 points of damage.
[Wed Feb 03 18:48:33 2021] You crush Deputy Keld for 34 points of damage.
[Wed Feb 03 18:48:36 2021] You crush Deputy Keld for 18 points of damage.
[Wed Feb 03 18:48:38 2021] You try to crush Deputy Keld, but Deputy Keld parries!
[Wed Feb 03 18:48:40 2021] You crush Deputy Keld for 26 points of damage.
[Wed Feb 03 18:48:43 2021] You crush Deputy Keld for 20 points of damage.
[Wed Feb 03 18:48:44 2021] Deputy Keld pierces YOU for 23 points of damage.
[Wed Feb 03 18:48:45 2021] Your will is not sufficient to command this weapon.
[Wed Feb 03 18:48:45 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:48:47 2021] You try to crush Deputy Keld, but Deputy Keld dodges!
[Wed Feb 03 18:48:50 2021] You crush Deputy Keld for 46 points of damage.
[Wed Feb 03 18:48:51 2021] Deputy Keld tries to kick YOU, but misses!
[Wed Feb 03 18:48:52 2021] You crush Deputy Keld for 6 points of damage.
[Wed Feb 03 18:48:54 2021] You try to crush Deputy Keld, but Deputy Keld dodges!
[Wed Feb 03 18:48:56 2021] Deputy Keld pierces YOU for 44 points of damage.
[Wed Feb 03 18:48:56 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:48:59 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:01 2021] You crush Deputy Keld for 41 points of damage.
[Wed Feb 03 18:49:03 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:06 2021] You crush Deputy Keld for 40 points of damage.
[Wed Feb 03 18:49:08 2021] Deputy Keld pierces YOU for 2 points of damage.
[Wed Feb 03 18:49:08 2021] You have become better at Dodge! (61)
[Wed Feb 03 18:49:08 2021] Deputy Keld tries to pierce YOU, but misses!
[Wed Feb 03 18:49:08 2021] You try to crush Deputy Keld, but Deputy Keld ripostes!
[Wed Feb 03 18:49:10 2021] You crush Deputy Keld for 40 points of damage.
[Wed Feb 03 18:49:13 2021] You crush Deputy Keld for 40 points of damage.
[Wed Feb 03 18:49:15 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:17 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:19 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:20 2021] You have become better at Dodge! (62)
[Wed Feb 03 18:49:20 2021] Deputy Keld pierces YOU for 52 points of damage.
[Wed Feb 03 18:49:22 2021] You crush Deputy Keld for 36 points of damage.
[Wed Feb 03 18:49:22 2021] Deputy Keld bashes YOU for 9 points of damage.
[Wed Feb 03 18:49:24 2021] You crush Deputy Keld for 40 points of damage.
[Wed Feb 03 18:49:26 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:29 2021] Your will is not sufficient to command this weapon.
[Wed Feb 03 18:49:29 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:31 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:32 2021] Deputy Keld pierces YOU for 41 points of damage.
[Wed Feb 03 18:49:32 2021] Deputy Keld tries to pierce YOU, but misses!
[Wed Feb 03 18:49:33 2021] Deputy Keld tries to pierce YOU, but misses!
[Wed Feb 03 18:49:33 2021] You try to crush Deputy Keld, but Deputy Keld ripostes!
[Wed Feb 03 18:49:36 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:38 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:40 2021] You crush Deputy Keld for 18 points of damage.
[Wed Feb 03 18:49:42 2021] You crush Deputy Keld for 22 points of damage.
[Wed Feb 03 18:49:44 2021] Deputy Keld tries to pierce YOU, but misses!
[Wed Feb 03 18:49:45 2021] You crush Deputy Keld for 12 points of damage.
[Wed Feb 03 18:49:47 2021] You crush Deputy Keld for 42 points of damage.
[Wed Feb 03 18:49:49 2021] You crush Deputy Keld for 6 points of damage.
[Wed Feb 03 18:49:52 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:49:54 2021] Deputy Keld kicks YOU for 4 points of damage.
[Wed Feb 03 18:49:54 2021] Your will is not sufficient to command this weapon.
[Wed Feb 03 18:49:54 2021] You crush Deputy Keld for 40 points of damage.
[Wed Feb 03 18:49:56 2021] Deputy Keld pierces YOU for 15 points of damage.
[Wed Feb 03 18:49:56 2021] Deputy Keld pierces YOU for 33 points of damage.
[Wed Feb 03 18:49:56 2021] You crush Deputy Keld for 32 points of damage.
[Wed Feb 03 18:49:59 2021] You crush Deputy Keld for 18 points of damage.
[Wed Feb 03 18:50:01 2021] You crush Deputy Keld for 8 points of damage.
[Wed Feb 03 18:50:03 2021] You crush Deputy Keld for 2 points of damage.
[Wed Feb 03 18:50:05 2021] You crush Deputy Keld for 36 points of damage.
[Wed Feb 03 18:50:08 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:10 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:12 2021] You crush Deputy Keld for 40 points of damage.
[Wed Feb 03 18:50:15 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:17 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:19 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:21 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:24 2021] You crush Deputy Keld for 38 points of damage.
[Wed Feb 03 18:50:26 2021] You try to crush Deputy Keld, but miss!
[Wed Feb 03 18:50:28 2021] You crush Deputy Keld for 26 points of damage.
[Wed Feb 03 18:50:31 2021] You crush Deputy Keld for 32 points of damage.
[Wed Feb 03 18:50:31 2021] You have slain Deputy Keld!
As you can see, I did at least 815 damage within 2 minutes and 11 seconds. At level 24, a Shaman's best DoT is
https://wiki.project1999.com/Envenomed_Breath . To kill the same mob with Envenomed Breath, you would need to cast it four times. This would take a total of 28 ticks, which is 168 seconds, or 2 minutes and 48 seconds. My Cleric did more DPS with white damage than the level 24 DoT, using Silver Chitin Hand Wraps and a Poison Wind Censor.
I don't have a 30s priest to do a similar test, but remember Shamans get a 30% haste at level 29, and a damage table boost at 30, both of which are considerable increases to DPS.