How's this merrow?

[Quickleaf]

Trying my hand at creating some 4e merrow (aquatic ogres) of about 3rd level for an adventure I'm putting together. I'm thinking a Skulk (lurker), Harpoon Hunter (artillery), and a Gaffer (brute). Here's the lurker...How'd I do?

Merrow Skulk
Large natural humanoid, Level 3 Lurker, XP 150

Initiative: +2
Senses: Perception +3; low-light vision
HP 70; Bloodied 35
AC 18; Fortitude 14, Reflex 14, Will 11
Speed 6, Climb 6, Swim 7

Grapple (standard; at will) +8 vs. AC
Poison Dagger (standard; at will) +6 vs. AC; 1d4 +5 damage + poison
Amphibious Invisibility: The merrow skulk is invisible underwater, and likewise invisible to observers on shore.
Aquatic Ambush: When attacking from water on a surprise round the merrow skulk can start a grapple as a free action without provoking an attack of opportunity. If the grapple is successful, the merrow skulk can immediately drag the target underwater to be drowned.
Slippery: Opponents suffer a -4 penalty on grapple checks to subdue (not escape) the merrow skulk in a grapple.

Alignment: Evil
Languages: Common, Giant
Skills: Stealth +10, Thievery +10
Abilities: Str 19 (+4), Con 15 (+2), Dex 14 (+2), Int 8 (-1), Wis 10, Cha 7 (-2)
Equipment: poison dagger, hag's eye

 

[Kordeth]

Off the top of my head, Aquatic Invisibility seems a little too good. I'd consider modeling it after the warlock's shadow step ability--if the Merrow moves more than 3 squares while in water, it has concealment until the end of its next turn.

 

[Lackhand]

How do you want this encounter to go? I'd suggest, as ogres are big, slow moving brutes, giving the poor guy (water based -- pour guy?) the *opposite* of the warlock's ability, concealment when it moves less than 3 squares in the water. Besides, that's difficult terrain

Give it another point of will save. Its poison 'dagger' should probably be a d6, and use followup mechanics (Poison Dagger: +X vs AC for d6 + strength. Followup attack: +Y vs Fort, 5 damage 'till save + mockery.)

That stealth is ridiculous

Otherwise, I don't really know how to compare the numbers, but it seems okay. Maybe a little on the weak side (in terms of non-AC defenses), so I expect it'll go down pretty quickly before concentrated /encounter abilities, but depending on what else you put in the encounter, it should be fine.

Might give it Fire Resist 5, due to being waterlogged.