He is beatable if you cheese the system with temporary points, but that shouldn't be a requirement for a boss at that level!
IRC LOG
[09:48:19] <SomeGirl> Hey DarkGod2: Can we please nerf the Half finished bone giant?
[09:48:37] <SomeGirl> 50+ dex is a bit.. much
[09:49:43] <DarkGod2> it jsut means he can hit you reliably
[09:49:47] <DarkGod2> and is hard to hit
[09:49:52] <SomeGirl> 22 defense
[09:49:52] <DarkGod2> it's part of him
[09:49:56] <DarkGod2> yes
[09:50:12] <SomeGirl>

[09:50:18] <Koralin> 22 defense means most melee classes use the temporary talent point trick or they can't win
[09:50:23] <Reenen> yes, just drop his defense
[09:50:29] <Koralin> no, its alway sbeatable, with tactics that are really dumb :p.
[09:50:34] <Reenen> though I plan for it ahead of time
[09:51:09] <Reenen> learning combat accuracy as well as ... precise strikes
[09:51:14] <Reenen> then unlearning it afterwards
[09:51:15] <Koralin> I plan to put 3 points in accuracy then take them out!
[09:51:45] <SomeGirl> I guess cheesing him works fine
[09:51:54] <SomeGirl> I just had issues hitting him on my goddamn archer
[09:51:57] <Koralin> it just takes forever and is a silly thing to require
[09:51:59] <Reenen> Koralin: you can't get 3
[09:52:04] <Reenen> you're too low a level
[09:52:10] <Egglet> who?
[09:52:12] <Koralin> hell if I remember
[09:52:18] <Reenen> you're usually lvl 3 when you get to the half finished giant
[09:52:19] <DarkGod2> make a post please so I dont forget