NOTES:

If a tehta intersects with the telco of a tengwa, hold Shift to place it above.

Some tengwar have capitalized variants - T, S, and K. These represent th, sh, and gh, respectively.

Long vowels are written with both upper and lower tehtar; broom would be typed brUum. If this is not possible, the long vowel marker (typed with a capital J) is used; "thee" would be typed tIiH or tIJ.

Vowels at the end of a word are written below a vowel marker, typed with a capital H.

Three abbreviations are present: @, &, and _, representing ash (a/one), agh (and), and ishi (in/inside), respectively. More may be added. 

My interpretation of a variation of the Tengwar optimized for Blackspeech and rendered in a unique style commissioned by the Dark Lord Himself.

Something to note: The symbol for th is represented by what should be the symbol for f, and the symbol for s is represented by what should be the symbol for th. This was to keep a consistent one base wide width for all of the characters. As well, nonstandard forms of h, s, z, l, and r were chosen specifically to keep the consistency between letters to an absolute maximum.