The Summoner is an Animal and a Superunique.

The Summoner is found at the tip of one of the four arms of the Arcane Sanctuary, a strangely-beautiful, psychedelic-styled area in Act Two. Which of the four tips the Summoner occupies is randomized, but his is a bit longer than the others and has a distinctive shape, so you'll know it as soon as you get near, even if the quest button pop up doesn't warn you. The Summoner is a quest boss; he must be killed to finish the fifth quest in Act Two, and killing him is required to open a portal to the Canyon of the Magi and to learn which of the seven tombs of Tal Rasha is the true tomb.

In the v1.11 patch, the Summoner was given the ability to drop the Key of Hate, a quest item required to engage in the Pandemonium Event. This quest is only functional on the realms, so while the Summoner drops the key in single player games, it is of no use to those characters. The Key of Hate only drops on Hell difficulty, and the Summoner's odds to drop it (along with various other random items) increase when there are more players in the game:

1-2 players: 8.6%
3-4 players: 11.6%
5-6 players: 12.5%
7-8 players: 12.8%

All values are listed by difficulty level: Normal / Nightmare / Hell.

Statistics

Name	Level	Experience	Hit Points	Speed	Max TC/Rune
The Summoner	18 / 55 / 80	305 / 26200 / 130,092	82-100 / 1290-1642 / 6167-7849	5	21/Nef, 48/Ko, 72/Lo

Offense

The Summoner's stats are all preset. He does not get any random Monster Modifiers.

The Summoner has no physical attacks or melee attacks. He is purely a spell caster, with a variety of Sorceress spells and one Necromancer curse. (But no summoning skills, ironically.)
The chill duration from Glacial Spike and Frost Nova increase with the difficulty level.
The Weaken Curse always reduces physical damage by 33%.
- Level 4: 8 yard radius, 21.1 sec duration.
- Level 7: 10 yard radius, 28.4 sec duration.
- Level 11: 12.6 yard radius, 38 sec duration.

Name	Glacial Spike	Frost Nova	Fireball	Firewall	Weaken
The Summoner	Cold Damage: 51-61 (2.6s) 78-90 (3s) 130-144 (3.4s)	Cold Damage: 10-14 (12s) 16-21 (15s) 28-35 (19s)	Fire Damage: 32-44 51-66 97-116	Fire Damage: 16-17/sec 25-26/sec 39-41/sec	Curse Level: 4 / 7 / 11

Defenses

Like all SuperUniques, The Summoner does not regenerate hit points.

Drain Effectiveness tells what % of a character's mana and life steal apply to that monster. 100 is all, 0 is none.
Chill Effectiveness tells what % of a character's cold length applies to the monster. 100 is all, 0 is no freeze/chill at all.

Name	Defense	Blocking	Regen Rate	Drain Effectiveness	Chill Effectiveness
The Summoner	165 / 642 / 1328	--	--	100 / 75 / 50	50 / 40 / 33

Resistances

Resistances over 99% are listed as immunities and monsters will take no damage from that type of attack.
Immunities can be "broken" by skills that lower resistance, if the value drops below 99%. See the Resistances page for more details.

Name	Physical	Fire	Cold	Lightning	Poison	Magic
The Summoner	0% / 0% / 0%	50% / 50% / 75%	50% / 5 0% / 75%	50% / 5 0% / 75%	0% / 0% / 0%	0% / 0% / 0%

Locations

All SuperUniques (except for Uber Diablo) are found in roughly the same location every game, on all three difficulty levels. (Except for the Uber Monsters who are only found on Hell Difficulty.)

Name	Location
The Summoner	Act 2: The Arcane Sanctuary