I want to ask how works transformation scroll . thx

If I know good you'll need lvl 50 with subclass and then hardin'll give u a quest for transformation. It's kinda easy and when you're done, you'll receive an onyx beast transformation that you can learn in Ivory Tower on human lvl. You can get a death blader scroll from marketeer of mammon and several other from adventurer guildsmen.

It's a 30minutes buff, you can use only your passives/equip and the transformed beast's skills. The re-use time is huge [much like a summon with a wizard], you can interrupt the skill manually as well.

Well the transformation scrolls as mentioned can be obtained by a quest starting at Hardin at lvl 50.
its very easy,the quest can be done once each time u are in the appropriate lvl to learn a new transfrm skill.
the most common reward is onyx beast,and death blader.
the rest is a bit rare and some of them are almost impossible to aqcuire.
Those cost like 10million on x1 server.
The re-use delay is 4 hours regardless ur atk.spd/cst.spd (for some of them)
Many transformtions are 30 mins use but others are 4hours/hours and kamael'final form which is 2 min O_O !

Most scrolls can be obtained by items from bosses. But I'd rather keep them for full items because you can get full c/b-grade stuff as well from adventurer's. Demon dagger powa.

on my server you can transformation scrolls buy , but you can buy t.s - wozard , healer ... dn others , i want to ask what do with them when i buy it , if i only clik on it , nothing happen.

You need the quest and visit the transformation teacher in IT human lvl.
Proper lvl is required for each one too.

u can buy them from black marketer from each city

here is a guide from official site

http://www.lineage2.com/Knowledge/comba ... tions.html

lineage2.com --->here u will find all the info u need!