<s>
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
is	O
a	O
massively	B-Protocol
multiplayer	I-Protocol
online	I-Protocol
role-playing	I-Protocol
game	I-Protocol
(	O
MMORPG	B-Protocol
)	O
developed	O
by	O
Turbine	O
for	O
Microsoft	B-Application
Windows	I-Application
and	O
OS	B-Operating_System
X	I-Operating_System
.	O
</s>
<s>
The	O
game	O
was	O
originally	O
marketed	O
as	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
:	I-Protocol
Stormreach	I-Protocol
.	O
</s>
<s>
Upon	O
switching	O
to	O
a	O
hybrid	O
free-to-play	O
model	O
it	O
was	O
renamed	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
:	O
Eberron	O
Unlimited	O
.	O
</s>
<s>
The	O
game	O
was	O
rebranded	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
,	O
with	O
the	O
introduction	O
of	O
Forgotten	O
Realms-related	O
content	O
.	O
</s>
<s>
Turbine	O
developed	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
as	O
an	O
online	O
adaptation	O
of	O
Dungeons	O
&	O
Dragons	O
(	O
D&D	O
)	O
,	O
originally	O
based	O
loosely	O
on	O
the	O
D&D	O
3.5	O
rule	O
set	O
.	O
</s>
<s>
The	O
game	O
is	O
set	O
on	O
the	O
unexplored	O
continent	O
of	O
Xen'drik	O
within	O
the	O
Eberron	O
campaign	O
setting	O
,	O
and	O
in	O
the	O
Kingdom	O
of	O
Cormyr	O
within	O
the	O
Forgotten	B-Application
Realms	I-Application
campaign	O
setting	O
.	O
</s>
<s>
Quests	O
are	O
narrated	O
by	O
a	O
Dungeon	B-Device
Master	I-Device
,	O
with	O
some	O
voiceover	O
work	O
done	O
by	O
Dungeons	O
&	O
Dragon	O
co-creators	O
Gary	O
Gygax	O
and	O
Dave	O
Arneson	O
.	O
</s>
<s>
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
:	I-Protocol
Stormreach	I-Protocol
was	O
developed	O
by	O
Turbine	O
over	O
two	O
years	O
.	O
</s>
<s>
In	O
June	O
2009	O
,	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
reopened	O
beta	O
testing	O
,	O
in	O
preparation	O
for	O
their	O
new	O
free-to-play	O
subscription	O
structure	O
.	O
</s>
<s>
Engadget	B-Application
noted	O
pros	O
and	O
cons	O
from	O
a	O
player	O
's	O
perspective	O
with	O
the	O
change	O
.	O
</s>
<s>
A	O
beta	O
of	O
the	O
OS	B-Operating_System
X	I-Operating_System
version	O
was	O
released	O
on	O
December	O
17	O
,	O
2012	O
.	O
</s>
<s>
On	O
June	O
9	O
,	O
2009	O
,	O
the	O
official	O
D&D	B-Protocol
Online	I-Protocol
website	O
announced	O
that	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
would	O
convert	O
to	O
a	O
subscriptionless	O
"	O
free	O
to	O
play	O
"	O
game	O
for	O
players	O
in	O
North	O
America	O
,	O
under	O
the	O
new	O
name	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
:	O
Eberron	O
Unlimited	O
.	O
</s>
<s>
The	O
level	O
cap	O
would	O
be	O
increased	O
to	O
level	O
20	O
and	O
free	O
users	O
would	O
have	O
access	O
to	O
the	O
majority	O
of	O
game	O
content	O
;	O
some	O
features	O
would	O
have	O
to	O
be	O
purchased	O
with	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
points	O
or	O
unlocked	O
through	O
play	O
.	O
</s>
<s>
Apart	O
from	O
new	O
adventures	O
among	O
the	O
fey	O
,	O
the	O
update	O
also	O
introduces	O
two	O
variants	O
of	O
the	O
Shifter	O
race	O
,	O
unicorn	B-Application
mounts	O
,	O
and	O
a	O
universal	O
enhancement	O
tree	O
:	O
the	O
Feydark	O
Illusionist	O
.	O
</s>
<s>
IGN	O
ranked	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
No	O
.	O
</s>
<s>
The	O
magazine	O
described	O
as	O
the	O
"	O
first	O
MMORPG	B-Protocol
to	O
prove	O
that	O
free-to-play	O
payment	O
plans	O
were	O
viable	O
alternatives	O
to	O
the	O
then-dominant	O
subscription	O
model.	O
"	O
</s>
<s>
Ontario-based	O
web	O
services	O
company	O
Treehouse	O
Avatar	O
Technologies	O
Inc	O
.	O
filed	O
a	O
patent	O
infringement	O
lawsuit	O
against	O
Turbine	O
,	O
Inc.	O
,	O
which	O
claimed	O
Dungeons	B-Protocol
&	I-Protocol
Dragons	I-Protocol
Online	I-Protocol
had	O
violated	O
United	O
States	O
Patent	O
No	O
.	O
</s>
