Eternal Tome - Army Troop Units in Clash of Clans

Eternal Tome hero-equipment-home-village

" Grand Warden and all nearby friendly units become immune to damage"

Base Attributes

User Grand Warden

Ability Type Active

Rarity Common

Unlock Requirement Available by default

Levels

Level	Ability duration	Upgrade cost shiny ore	Upgrade cost glowy ore	Blacksmith level required
1	3.2s	N/A	N/A	N/A
2	3.5s	120	-	1
3	4.2s	240	20	1
4	4.5s	400	-	1
5	4.7s	600	-	1
6	5.5s	840	100	1
7	5.7s	1,120	-	1
8	6.0s	1,440	-	1
9	6.7s	1,800	200	1
10	6.8s	1,900	-	3
11	6.9s	2,000	-	3
12	7.2s	2,100	400	3
13	7.3s	2,200	-	5
14	7.4s	2,300	-	5
15	7.7s	2,400	600	5
16	7.8s	2,500	-	7
17	7.9s	2,600	-	7
18	8.2s	2,700	600	7

Summary

The Eternal Tome is a piece of Common Hero Equipment for the Grand Warden . It is one of two pieces of Hero Equipment that the Grand Warden starts with, the other being the Life Gem .
The Eternal Tome appears as a book with golden corners, has a large number of pages which are held by ropes, and at the center is a purple gem with golden outlines. When equipped, it enables the Grand Warden to turn all units around him, including himself, invincible when he uses his ability. The area of effect is denoted by a circular ring centered around the Warden.
Note that invincibility only negates direct damage, and certain effects can still affect invincible units. For example: Slowdown effects, such as inflicted by a Poison Spell Tower or defensive Headhunter , can still work on invincible units; Traps like Giant Bombs may cause knockback on smaller units it cannot kill due to their invincibility; The Air Sweeper will push back invincible units not differently; and Spring Traps can still eliminate affected units completely.
Slowdown effects, such as inflicted by a Poison Spell Tower or defensive Headhunter , can still work on invincible units;
Traps like Giant Bombs may cause knockback on smaller units it cannot kill due to their invincibility;
The Air Sweeper will push back invincible units not differently; and
Spring Traps can still eliminate affected units completely.
The Eternal Tome's effect is applied at the moment the ability is activated, but will only affect units in the radius: any units that subsequently leave the area of effect before the duration expires will lose invincibility after one second. Units that enter (or are spawned in) the area of effect after the ability is activated will gain invincibility.

Strategies

Use the Eternal Tome ability near the core so your troops can get through the core, where the most damage usually is. Against a level 5 Giga Tesla or a Giga Inferno , it may be useful to save the ability specifically for the explosion when the Town Hall is destroyed, as it does severe damage. Against level 14-16 Town Halls, the bomb's poison effect that occurs will outlast the Eternal Tome, but when sufficiently leveled, it can negate the damage for most of the poison's duration. Likewise for the Inferno Artillery at Town Hall 17, the damage from the fire pools will outlast the ability, but most of the damage of the first volley will have no effect to the invincible units if sufficiently leveled.
Against level 14-16 Town Halls, the bomb's poison effect that occurs will outlast the Eternal Tome, but when sufficiently leveled, it can negate the damage for most of the poison's duration. Likewise for the Inferno Artillery at Town Hall 17, the damage from the fire pools will outlast the ability, but most of the damage of the first volley will have no effect to the invincible units if sufficiently leveled.
Take advantage of the invincibility period by ensuring that invincible units do as much damage as possible during that time. Rage Spells are useful to buff invincible troops and can be used with minimal risk of wasting the spell, since the units are unlikely to get taken out.
The Eternal Tome's invincibility effect can be used to greatly increase the chance that the Battle Blimps reach their intended drop location for the strategies that use them. However, do note that the Eternal Tome does not stop the Air Sweeper 's pushback, so they must be avoided or neutralized with a Freeze Spell . Lightning Spells also work if you can also damage other defenses in its radius, otherwise it is not worth it for this alone.
Lightning Spells also work if you can also damage other defenses in its radius, otherwise it is not worth it for this alone.
This pairs well with the Healing Tome , as during the invincibility period, the troops cannot take damage, meaning that the troops can actually get a good amount of healing from the Healing Tome, which could be needed if you are attacking a high-DPS area and could even save low-hitpoint troops from dying if done correctly, and the healing will help the troops take out most of the defenses. It also pairs well with the Rage Gem, because of the extra damage done by the ability, and the Eternal Tome can help negate some of the damage when entering the base, which could be very helpful and allowing the troops to do more damage.
It also pairs well with the Rage Gem, because of the extra damage done by the ability, and the Eternal Tome can help negate some of the damage when entering the base, which could be very helpful and allowing the troops to do more damage.

Offensive Strategies

Use the Eternal Tome ability near the core so your troops can get through the core, where the most damage usually is. Against a level 5 Giga Tesla or a Giga Inferno , it may be useful to save the ability specifically for the explosion when the Town Hall is destroyed, as it does severe damage. Against level 14-16 Town Halls, the bomb's poison effect that occurs will outlast the Eternal Tome, but when sufficiently leveled, it can negate the damage for most of the poison's duration. Likewise for the Inferno Artillery at Town Hall 17, the damage from the fire pools will outlast the ability, but most of the damage of the first volley will have no effect to the invincible units if sufficiently leveled.
Against level 14-16 Town Halls, the bomb's poison effect that occurs will outlast the Eternal Tome, but when sufficiently leveled, it can negate the damage for most of the poison's duration. Likewise for the Inferno Artillery at Town Hall 17, the damage from the fire pools will outlast the ability, but most of the damage of the first volley will have no effect to the invincible units if sufficiently leveled.
Take advantage of the invincibility period by ensuring that invincible units do as much damage as possible during that time. Rage Spells are useful to buff invincible troops and can be used with minimal risk of wasting the spell, since the units are unlikely to get taken out.
The Eternal Tome's invincibility effect can be used to greatly increase the chance that the Battle Blimps reach their intended drop location for the strategies that use them. However, do note that the Eternal Tome does not stop the Air Sweeper 's pushback, so they must be avoided or neutralized with a Freeze Spell . Lightning Spells also work if you can also damage other defenses in its radius, otherwise it is not worth it for this alone.
Lightning Spells also work if you can also damage other defenses in its radius, otherwise it is not worth it for this alone.
This pairs well with the Healing Tome , as during the invincibility period, the troops cannot take damage, meaning that the troops can actually get a good amount of healing from the Healing Tome, which could be needed if you are attacking a high-DPS area and could even save low-hitpoint troops from dying if done correctly, and the healing will help the troops take out most of the defenses. It also pairs well with the Rage Gem, because of the extra damage done by the ability, and the Eternal Tome can help negate some of the damage when entering the base, which could be very helpful and allowing the troops to do more damage.
It also pairs well with the Rage Gem, because of the extra damage done by the ability, and the Eternal Tome can help negate some of the damage when entering the base, which could be very helpful and allowing the troops to do more damage.

Defensive Strategies

Do not put the most powerful defenses and traps together so that opponent does not get the highest value from Eternal Tome with that invincibility period.
Defenses and traps that stall attackers' movements can be effective in wasting the Eternal Tome's duration, preventing them from getting free damage. The Tornado Trap is extremely effective for this, but only one can be placed on the base, so it should be saved for locations where Eternal Tome activation is most likely.
Spring Traps are still able to destroy troops with 18 housing space or less, even when protected by the Eternal Tome.

Statistics

Level 6: 5.5s -> 5.25s
Level 7: 5.75s -> 5.5s
Level 8: 6s -> 5.75s
Level 9: 7s -> 6.5s
Level 10: 7.2s -> 6.6s
Level 11: 7.4s -> 6.7s
Level 12: 8s -> 7s
Level 13: 8.2s -> 7.1s
Level 14: 8.4s -> 7.2s
Level 15: 9s -> 7.5s
Level 16: 9.1s -> 7.6s
Level 17: 9.2s -> 7.7s
Level 18: 9.5s -> 8s

Equipment Migration

Level 6: 5.5s -> 5.25s
Level 7: 5.75s -> 5.5s
Level 8: 6s -> 5.75s
Level 9: 7s -> 6.5s
Level 10: 7.2s -> 6.6s
Level 11: 7.4s -> 6.7s
Level 12: 8s -> 7s
Level 13: 8.2s -> 7.1s
Level 14: 8.4s -> 7.2s
Level 15: 9s -> 7.5s
Level 16: 9.1s -> 7.6s
Level 17: 9.2s -> 7.7s
Level 18: 9.5s -> 8s

History

Level 6: 5.5s -> 5.25s
Level 7: 5.75s -> 5.5s
Level 8: 6s -> 5.75s
Level 9: 7s -> 6.5s
Level 10: 7.2s -> 6.6s
Level 11: 7.4s -> 6.7s
Level 12: 8s -> 7s
Level 13: 8.2s -> 7.1s
Level 14: 8.4s -> 7.2s
Level 15: 9s -> 7.5s
Level 16: 9.1s -> 7.6s
Level 17: 9.2s -> 7.7s
Level 18: 9.5s -> 8s

Trivia

The Eternal Tome is currently the only piece of Hero Equipment not to give any passive boosts to the Hero using it.
It is also one of only two pieces of Hero Equipment to give an increase to the ability's attributes at every level, the other being the Invisibility Vial .
Since the June 16, 2025 update, the Eternal Tome has similar mechanics to that of the Rage Gem and the Healing Tome, but delayed by one second before losing the boost. Coincidentally, both of these Equipments are Common in rarity.
Coincidentally, both of these Equipments are Common in rarity.