<s>
Ragnarok	B-Application
(	O
released	O
in	O
Europe	O
as	O
Valhalla	O
)	O
is	O
a	O
freeware	B-License
Roguelike	O
video	O
game	O
for	O
MS-DOS	B-Application
®	I-Application
,	O
developed	O
by	O
Norsehelm	O
Productions	O
(	O
Thomas	O
F	O
.	O
Boyd	O
and	O
Rob	O
Vawter	O
)	O
from	O
1992	O
to	O
1995	O
.	O
</s>
<s>
Ragnarok	B-Application
is	O
based	O
on	O
Norse	O
mythology	O
,	O
with	O
many	O
of	O
the	O
gods	O
,	O
realms	O
,	O
items	O
,	O
and	O
quests	O
drawing	O
directly	O
from	O
it	O
,	O
such	O
as	O
:	O
</s>
<s>
Ragnarok	B-Application
has	O
multiple	O
features	O
uncommon	O
amongst	O
roguelike	O
games	O
,	O
such	O
as	O
a	O
graphical	B-Application
interface	I-Application
,	O
a	O
historical	O
or	O
mythological	O
setting	O
,	O
set	O
quests	O
,	O
the	O
ability	O
to	O
change	O
classes	O
,	O
and	O
the	O
ability	O
to	O
permanently	O
change	O
one	O
's	O
race	O
via	O
polymorphing	O
.	O
</s>
<s>
Character	O
development	O
is	O
one	O
of	O
the	O
main	O
focuses	O
of	O
Ragnarok	B-Application
.	O
</s>
<s>
Potion	O
of	O
Transformation	O
–	O
similar	O
to	O
the	O
Wand	O
of	O
Polymorph	O
,	O
but	O
made	O
with	O
the	O
use	O
of	O
the	O
Alchemy	B-Language
skill	O
.	O
</s>
<s>
Viking	B-Application
–	O
a	O
physically	O
strong	O
character	O
who	O
gains	O
the	O
weapon	O
master	O
ability	O
.	O
</s>
<s>
Alchemist	B-Language
–	O
a	O
physically	O
weak	O
character	O
who	O
learns	O
to	O
mix	O
potions	O
.	O
</s>
<s>
A	O
master	O
alchemist	B-Language
is	O
able	O
to	O
make	O
the	O
Potion	O
of	O
Second	O
Life	O
,	O
which	O
as	O
the	O
name	O
suggests	O
,	O
brings	O
the	O
player	O
back	O
to	O
life	O
as	O
soon	O
as	O
he	O
is	O
killed	O
.	O
</s>
<s>
One	O
element	O
of	O
Ragnarok	B-Application
gameplay	O
is	O
that	O
slain	O
player	O
characters	O
leave	O
behind	O
'	O
ghost	O
data	O
 '	O
for	O
the	O
next	O
adventurer	O
to	O
encounter	O
.	O
</s>
<s>
Locate	O
and	O
return	O
Mjölnir	O
to	O
Thor	B-Algorithm
.	O
</s>
<s>
Locate	O
and	O
return	O
Gjallarhorn	O
to	O
Heimdall	B-Application
.	O
</s>
<s>
Locate	O
and	O
return	O
Gungnir	B-Application
to	O
Odin	B-Application
.	O
</s>
